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A value is said to be a root of a polynomial if ..

The largest exponent of appearing in is called the degree of . If has degree , then it is well known that there are roots, once one takes into account multiplicity. To understand what is meant by multiplicity, take, for example, . This polynomial is considered to have two roots, both equal to 3.

One learns about the "factor theorem," typically in a second course on algebra, as a way to find all roots that are rational numbers. One also learns how to find roots of all quadratic polynomials, using square roots (arising from the discriminant) when necessary. There are more advanced formulas for expressing roots of cubic and quartic polynomials, and also a number of numeric methods for approximating roots of arbitrary polynomials. These use methods from complex analysis as well as sophisticated numerical algorithms, and indeed, this is an area of ongoing research and development.

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Solve for x

Solve for x is all related to finding the value of x in an equation of one variable that is x or with different variables like finding x in terms of y. When we find the value of x and substitute it in the equation, we should get L.H.S = R.H.S.

What Does Solve for x Mean?

Solve for x means finding the value of x for which the equation holds true. i.e when we find the value of x and substitute in the equation, we should get L.H.S = R.H.S If I ask you to solve the equation 'x + 1 = 2' that would mean finding some value for x that satisfies the equation. Do you think x = 1 is the solution to this equation? Substitute it in the equation and see. 1 + 1 = 2 2 = 2 L.H.S = R.H.S That’s what solving for x is all about.

How Do You Solve for x?

To solve for x, bring the variable to one side, and bring all the remaining values to the other side by applying arithmetic operations on both sides of the equation. Simplify the values to find the result. Let’s start with a simple equation as, x + 2 = 7 How do you get x by itself? Subtract 2 from both sides ⇒ x + 2 - 2 = 7 - 2 ⇒ x = 5 Now, check the answer, x = 5 by substituting it back into the equation. We get 5 + 2= 7. L.H.S = R.H.S

Solve for x in the Triangle

Solve for x" the unknown side or angle in a triangle we can use properties of triangle or the Pythagorean theorem.

Let us understand solve for x in a triangle with the help of an example.

△ ABC is right-angled at B with two of its legs measuring 7 units and 24 units. Find the hypotenuse x.

Solve for x in triangle

In △ABC by using the Pythagorean theorem,

we get AC 2 = AB 2 + BC 2

⇒ x 2 = 7 2 + 24 2

⇒ x 2 = 49 + 576

⇒ x 2 = 625

⇒ x = 25 units

Solve for x to find Missing Angle of Triangle

Suppose angle A = 50°, angle B = 60°, and angle C = x are the angles of a triangle. ABC. By using the angle sum property we can find the value of x.

angle A + angle B + angle C = 180 degrees.

50° + 60° + x° = 180° ⇒ x = 70°

Solve for x in Fractions

Solve for x in fractions , we simply do the cross multiplication and simplify the equation to find x.

For example: Solve for x for equation ⇒ 2/5 = x/10.

Cross multiply the fractions ⇒ 2 × 10 = 5 × x Solve the equation for x ⇒ x = 20 / 5 Simplify for x ⇒ x = 4 To verify the x value put the result, 4 back into the given equation ⇒ 2/5 = 4/10 Cross multiply the fractions ⇒ 2 × 10 = 4 × 5 ⇒ 20 = 20 L.H.S = R.H.S

Solve for x Equations

We can use a system of equations solver to find the value of x when we have equations with different variables.

We solve one of the equations for the x variable (solve for x in terms of y) and then substitute it in the second equation, and then solve for the y variable.

Finally, we substitute the value of the x variable that we found in one of the equations and solve for the other variable.

Let us understand solve for x and y with the help of an example.

For example, Solve for x: 2x - y = 5, 3x + 2y = 11

⇒ 2x - y = 5

Adding y on both sides we get,

⇒ 2x - y + y = 5 + y

⇒ 2x = 5 + y

⇒ x = (5 + y) / 2

Above equation is known as x in terms of y.

Substitute x = (5 + y) / 2 in second equation 3(5 + y) / 2 + 2y = 11

⇒ (15 + 3y) / 2 + 2y = 11

⇒ (15 + 3y + 4y) / 2 = 11

⇒ (15 + 7y) / 2 = 11

⇒15 +7y = 22

⇒ 7y = 22 - 15

Now, substitute y = 1 in x = (5+y) / 2

⇒ x = (5 + 1) / 2

⇒ 6 / 2 = 3

Thus, the solution of the given system of equations is x = 3 and y = 1.

Important Notes on Solve for x

  • To solve for x (the unknown variable in the equation), apply arithmetic operations to isolate the variable.
  • For solving 'x' number of equations we need exactly 'x' number of variables.
  • Solve for x and y can be done by the substitution method, elimination method, cross-multiplication method, etc.

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Solve for x Examples

Example1: Solve for x: 2 ( 3x + 1 ) + 3 ( 5x + 2 ) = x - 1

Solution: 2 (3x + 1) + 3 (5x + 2) = x - 1

⇒ 6x + 2 + 15x + 6 = x - 1

⇒ 8 + 21x = x - 1

⇒ x = -9/20

Example 2: It is given that x is the one side of the chessboard and it is smaller than its perimeter by 18 inches. Form an equation and solve for x?

Solution: The side of chessboard = 'x' inches

Since the chessboard is square (all sides are equal), therefore its perimeter will be '4x' inches

According to the given condition,

Perimeter = x + 18

⇒ 4x = x + 18

⇒ 4x - x = 18

The side of the chessboard is 6 inches.

Example 3: The ages of Roony and Herald are 5x and 7x. If four years later, the sum of their ages will be 56 years, then form an equation and solve for x.

Solution: The Rooney and Herald's age is 5x and 7x.

The sum of their ages after 4 years = 56

According to given condition,

⇒ (5x+4) + (7x+4) = 56

⇒ 5x + 7x + 4 + 4 = 56

⇒ 12x + 8 = 56

⇒ 12x = 56 - 8

⇒ x = 48/12

⇒ x = 4 The age of Roony = 5 × 4 = 20 years The age of Herald = 7× 4 = 28 years

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FAQs on Solve For x

How do you solve for x in a bracket.

To solve for x in a bracket we use distributive law and remove the bracket, move all the x terms to one side and constant to the other side and find the unknown x. For example, 2(x−3) = 4 By using distributive law, 2x - 6 = 4 ⇒ 2x = 4 + 6 ⇒ 2x = 10 ⇒ x = 10/2 ⇒ x = 5

How Do You Solve for x in a Fraction?

To solve for x in fractions we have to eliminate the denominator by cross multiplication and then solve for x. For example, x/4 + 1/2 = 5/2 ⇒ (2x+4)/8 = 5/2 By doing cross multiplication we get, 2(2x + 4) = 8(5) ⇒ 4x + 8 = 40 ⇒ 4x = 40 - 8 ⇒ 4x = 32 ⇒ x = 32 / 4 ⇒ x = 8

How Do You Solve for x for the Equation 4x + 2 = -8?

To solve for x follow the points.

  • Start with 4x + 2 = -8
  • Subtract 2 from both sides: 4x = -8 - 2 = -10
  • Divide by 4: x = -10 ÷ 4 = -5/2

How Do You Solve for x for the Equation 3x - 7 = 26?

  • Start with 3x - 7 = 26
  • Add 7 to both sides: 3x - 7 + 7 = 26 + 7
  • Calculate: 3x = 33
  • Divide by 3: x = 33 ÷ 3

How Do You Solve for x in Vertical Angles?

Vertical angles are congruent , or we can say they have same measure. For example, if a vertical angle equals 2x and the other equals 90 - x, we would simply form an equation 2x = 90 - x. 2x = 90 - x Add x to both sides, 2x + x = 90 -x + x 3x = 90 x = 30

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How to Solve for X

Last Updated: May 3, 2024 Fact Checked

This article was co-authored by David Jia . David Jia is an Academic Tutor and the Founder of LA Math Tutoring, a private tutoring company based in Los Angeles, California. With over 10 years of teaching experience, David works with students of all ages and grades in various subjects, as well as college admissions counseling and test preparation for the SAT, ACT, ISEE, and more. After attaining a perfect 800 math score and a 690 English score on the SAT, David was awarded the Dickinson Scholarship from the University of Miami, where he graduated with a Bachelor’s degree in Business Administration. Additionally, David has worked as an instructor for online videos for textbook companies such as Larson Texts, Big Ideas Learning, and Big Ideas Math. There are 8 references cited in this article, which can be found at the bottom of the page. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 809,521 times.

There are a number of ways to solve for x, whether you're working with exponents and radicals or if you just have to do some division or multiplication. No matter what process you use, you always have to find a way to isolate x on one side of the equation so you can find its value. Here's how to do it:

How do you solve for X in equations?

  • For basic linear equations: Follow the order of operations (using PEMDAS) to resolve the equation.
  • For exponents: Separate the exponent variable from the rest of the equation and find the square root of each side.
  • For fractions: Cross-multiply to create a fraction-less equation, combine any like terms, and divide both sides by the x-value's coefficient.

Using a Basic Linear Equation

Step 1 Write down the problem.

  • 2 2 (x+3) + 9 - 5 = 32

Step 2 Resolve the exponent.

  • 4(x+3) + 9 - 5 = 32

Step 3 Do the multiplication....

  • 4x + 12 + 9 - 5 = 32

Step 4 Do the addition...

  • 4x+21-5 = 32
  • 4x + 16 - 16 = 32 - 16

Step 5 Isolate the variable.

  • 4x/4 = 16/4

Joseph Meyer

Joseph Meyer

To solve an equation for a variable like "x," you need to manipulate the equation to isolate x. Use techniques like the distributive property, combining like terms, factoring, adding or subtracting the same number, and multiplying or dividing by the same non-zero number to isolate "x" and find the answer.

Step 6 Check your work.

  • 2 2 (x+3)+ 9 - 5 = 32
  • 2 2 (4+3)+ 9 - 5 = 32
  • 2 2 (7) + 9 - 5 = 32
  • 4(7) + 9 - 5 = 32
  • 28 + 9 - 5 = 32
  • 37 - 5 = 32

With Exponents

Step 1 Write down the problem.

  • 2x 2 + 12 = 44

Step 2 Isolate the term with the exponent.

  • 2x 2 +12-12 = 44-12

Step 3 Isolate the variable with the exponent by dividing both sides by the coefficient of the x term.

  • (2x 2 )/2 = 32/2
  • 4 Take the square root of each side of the equation. [6] X Research source Taking the square root of x 2 will cancel it out. So, take the square root of both sides. You'll get x left over on one side and plus or minus the square root of 16, 4, on the other side. Therefore, x = ±4.
  • 2(4) 2 + 12 = 44
  • 2(16) + 12 = 44
  • 32 + 12 = 44

Using Fractions

Step 1 Write down the problem.

  • (x + 3)/6 = 2/3

Step 2 Cross multiply...

  • (x + 3) x 3 = 3x + 9
  • 3x + 9 = 12

Step 3 Combine like terms.

  • 3x + 9 - 9 = 12 - 9

Step 4 Isolate x by dividing each term by the x coefficient.

  • (1 + 3)/6 = 2/3

Using Radical Signs

Step 1 Write down the problem.

  • √(2x+9) - 5 = 0

Step 2 Isolate the square root.

  • √(2x+9) - 5 + 5 = 0 + 5
  • √(2x+9) = 5

Step 3 Square...

  • (√(2x+9)) 2 = 5 2
  • 2x + 9 = 25

Step 4 Combine like terms.

  • 2x + 9 - 9 = 25 - 9

Step 5 Isolate the variable.

  • √(2(8)+9) - 5 = 0
  • √(16+9) - 5 = 0
  • √(25) - 5 = 0

Using Absolute Value

Step 1 Write down the problem.

  • |4x +2| - 6 = 8

Step 2 Isolate the absolute...

  • |4x +2| - 6 + 6 = 8 + 6
  • |4x +2| = 14

Step 3 Remove the absolute value and solve the equation.

  • 4x + 2 = 14
  • 4x + 2 - 2 = 14 -2

Step 4 Remove the absolute value and change the sign of the terms on the opposite side of the equal sign before you solve.

  • 4x + 2 = -14
  • 4x + 2 - 2 = -14 - 2
  • 4x/4 = -16/4

Step 5 Check your work.

  • |4(3) +2| - 6 = 8
  • |12 +2| - 6 = 8
  • |14| - 6 = 8
  • |4(-4) +2| - 6 = 8
  • |-16 +2| - 6 = 8
  • |-14| - 6 = 8

Practice Problems and Answers

solve for x and y problems

Expert Q&A

David Jia

  • To check your work, plug the value of x back into the original equation and solve. Thanks Helpful 0 Not Helpful 1
  • Radicals, or roots, are another way of representing exponents. The square root of x = x^1/2. Thanks Helpful 0 Not Helpful 0

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You Might Also Like

Find the Maximum or Minimum Value of a Quadratic Function Easily

  • ↑ David Jia. Academic Tutor. Expert Interview. 23 February 2021
  • ↑ https://tutorial.math.lamar.edu/Classes/Alg/SolveLinearEqns.aspx
  • ↑ https://www.purplemath.com/modules/solvelin.htm
  • ↑ https://sciencing.com/tips-for-solving-algebraic-equations-13712207.html
  • ↑ https://www.youtube.com/watch?v=LMS1NR4gZN8
  • ↑ https://www.mathsisfun.com/algebra/fractions-algebra.html
  • ↑ http://www.mathsisfun.com/algebra/radical-equations-solving.html
  • ↑ http://www.sosmath.com/algebra/solve/solve0/solve0.html

About This Article

David Jia

To solve for x in a basic linear equation, start by resolving the exponent using the order of operations. Then, isolate the variable to get your answer. To solve for x when the equation includes an exponent, start by isolating the term with the exponent. Then, isolate the variable with the exponent by dividing both sides by the coefficient of the x term to get your answer. If the equation has fractions, start by cross-multiplying the fractions. Then, combine like terms and isolate x by dividing each term by the x coefficient. If you want to learn how to solve for x if the equation has radicals or absolute values, keep reading the article! Did this summary help you? Yes No

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VIDEO

  1. How to solve x+y in this equation|| learn how

  2. solve for x and y x-y=3. x/3+y/2=6

  3. A Nice Maths Problem

  4. can you solve x : y in this equation

  5. Solve (x-y)^2 dy/dx = a^2

  6. Solve: (x+y)(dx-dy)=dx+dy.#maths #seperableode#ode#shortsfeed #ordinarydifferentialequation#physics

COMMENTS

  1. solve for x and y

    Solve problems from Pre Algebra to Calculus step-by-step . step-by-step. solve for x and y. en. Related Symbolab blog posts. Practice, practice, practice. Math can be an intimidating subject. Each new topic we learn has symbols and problems we have never seen. The unknowing...

  2. Solving equations & inequalities

    Unit test. Level up on all the skills in this unit and collect up to 1,100 Mastery points! Start Unit test. There are lots of strategies we can use to solve equations. Let's explore some different ways to solve equations and inequalities. We'll also see what it takes for an equation to have no solution, or infinite solutions.

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  5. Intro to equations with variables on both sides

    1) When you have the variable on both sides, start by moving all the Xs to one side of the equation. In the example from the video, this means you need to move either the 2x or the 5x to the other side. It doesn't matter which you pick to move. Just pick one and use the opposite operation to move it.

  6. Equation Solver

    Algebra. Equation Solver. Step 1: Enter the Equation you want to solve into the editor. The equation calculator allows you to take a simple or complex equation and solve by best method possible. Step 2: Click the blue arrow to submit and see the result! The equation solver allows you to enter your problem and solve the equation to see the result.

  7. Solutions to 2-variable equations (video)

    To isolate y, first subtract 2x from both sides (4y = -2x + 100), then divide by 4 (y = -1/2 x + 25). This is the more common usage because this is a linear function in slope intercept form - y in terms of x or y dependent on x. To solve for x, subtract 4y from both sides (2x = - 4y + 100), then divide by 2 (x = - 2y + 50).

  8. 4 Ways to Solve Systems of Algebraic Equations Containing Two ...

    Each time x increases by one, the y-value will increase by the amount of the slope. Use this information to plot the point on the graph for each line when x = 1. (Alternatively, plug in x = 1 for each equation and solve for y.) In our example, the line y = -2x + 5 has a slope of -2. At x = 1, the line moves down 2 from the point at x = 0. Draw ...

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  10. Equation Solver: Wolfram|Alpha

    Equation solving; Tips for entering queries. Enter your queries using plain English. To avoid ambiguous queries, make sure to use parentheses where necessary. Here are some examples illustrating how to formulate queries. find roots to quadratic x^2-7x+12; plot inequality x^2-7x+12<=0; solve {3x-5y==2,x+2y==-1} plot inequality 3x-5y>=2 and x+2y<=-1

  11. Solve for X

    Solve for x in fractions, we simply do the cross multiplication and simplify the equation to find x. For example: Solve for x for equation ⇒ 2/5 = x/10. Cross multiply the fractions. ⇒ 2 × 10 = 5 × x. Solve the equation for x. ⇒ x = 20 / 5. Simplify for x.

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  14. 6 Ways to Solve for X

    5. Isolate the variable. The last thing you have to do to solve for x is to isolate the variable by dividing both sides of the equation by 2, the coefficient of the x term. 2x/2 = x and 16/2 = 8, so you're left with x = 8. 6. Check your work. Plug 8 back in to the equation for x to see if you get the right answer:

  15. Finding the x and y Intercepts

    Its y-intercept can be written as the point [latex](0,3)[/latex]. Example 2:Find the x and y-intercepts of the line [latex]y = - 2x + 4[/latex]. To find the x-intercepts algebraically, we let [latex]y=0[/latex] in the equation and then solve for values of [latex]x[/latex]. In the same manner, to find for [latex]y[/latex]-intercepts ...

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  17. Substitution method review (systems of equations)

    In order to use the substitution method, we'll need to solve for either x or y in one of the equations. Let's solve for y in the second equation: − 2 x + y = 9 y = 2 x + 9. Now we can substitute the expression 2 x + 9 in for y in the first equation of our system: 7 x + 10 y = 36 7 x + 10 ( 2 x + 9) = 36 7 x + 20 x + 90 = 36 27 x + 90 = 36 3 x ...

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  22. Answered: 2. (2y-1)=(3x²+1), given x=1 when d.x…

    Transcribed Image Text: Practice Exercise 151 Solving equations of dy the form =f(x) f(y) (Answers on page dx 878) In Problems 1 to 4, solve the differential equations. Expert Solution This question has been solved!

  23. Slope and y-intercept from equation (video)

    Slope and y-intercept from equation. Google Classroom. About. Transcript. In an equation in slope-intercept form (y=mx+b) the slope is m and the y-intercept is b. We can also rewrite certain equations to look more like slope-intercept form. For example, y=x can be rewritten as y=1x+0, so its slope is 1 and its y-intercept is 0.

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  26. Our tech has a climate problem: How we solve it : TED Radio Hour : NPR

    AI, EVs and satellites can help fight the climate crisis. But they, too, have an environmental cost. This hour, TED speakers examine how we can use each innovation without making the problem worse.

  27. Intro to slope-intercept form (y=mx+b)

    The forms y=mx+b and y=mx+a are essentially the same, except for the naming of the constant term. The form y=mx+b means slope m and y-intercept b; similarly, the form y=mx+a means slope m and y-intercept a. The form y=m (x-a) is essentially different from the other two forms, and means slope m and x-intercept (instead of y-intercept) a.

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