/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 29 Use factoring to solve quadratic... [FREE SOLUTION] | 91Ó°ÊÓ

91Ó°ÊÓ

Use factoring to solve quadratic equation. Check by substitution or by using a graphing utility and identifying \(x\)-intercepts. \(x^{2}=12 x-36\)

Short Answer

Expert verified
The solution to the quadratic equation \(x^{2}=12 x-36\) is \(x=6\).

Step by step solution

01

Rearrange the equation into standard form

Rearrange the given quadratic equation \(x^{2}=12 x-36\) into standard form to become \(x^{2}-12x+36=0\). This is done by subtracting \(12x\) and adding \(36\) on both sides of the equation.
02

Factorize the quadratic equation

Factorize the quadratic equation \(x^{2}-12x+36=0\) into \((x-6)(x-6) = 0\). This is done by breaking down the middle term (-12x) into two factors such that their sum equals the coefficient of x (-12) and their product equals the constant term (36).
03

Solve for x

Set each factor to zero and solve for x. This gives us \(x-6 = 0\), so \(x=6\). As both factors are the same, there is only one unique solution to this quadratic equation, which is \(x=6\).
04

Verify the solution

Substitute \(x=6\) back into the original equation \(x^{2}=12 x-36\) to verify the solutions. This gives \(36=72-36\) which simplifies to \(36=36\). As both sides of the equation are equal, it confirms that the solution is correct.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91Ó°ÊÓ!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Factoring Quadratic Equations
Factoring quadratic equations can sometimes seem daunting, but it's a straightforward process when broken down. When you have a quadratic like \(x^2 - 12x + 36 = 0\), your goal is to express it as a product of two binomials. The reason we do this is that finding out where this product equals zero will tell us the roots or solutions of the quadratic. Here, we factor it into \((x-6)(x-6) = 0\).
This factorization tells us that the expression becomes zero when \(x = 6\). That's because any number multiplied by zero equals zero. You look for two numbers that multiply to the last term (36, in this case) and add up to the middle coefficient (-12). Once you recognize that both terms are \(-6\) and \(-6\), you've found your solution. Factorization simplifies the process of solving quadratics dramatically by turning a square into a product of 2 linear expressions.
Standard Form of Quadratics
The standard form of a quadratic is usually written as \(ax^2 + bx + c = 0\). This form is incredibly useful because it allows us to apply various solution techniques, such as factoring, completing the square, or using the quadratic formula.
For the given problem, the equation \(x^2 = 12x - 36\) needed to be rearranged. By subtracting \(12x\) from both sides and adding \(36\), we rewrote it in the standard form as \(x^2 - 12x + 36 = 0\).
This transformation is crucial for consistency in solving different quadratic equations, since the standard form highlights all necessary terms for identification. Doing this step first ensures that no term is neglected in the process.
Quadratic Roots Verification
After solving the quadratic equation, verifying the roots ensures accuracy. Suppose our solution to the equation was \(x = 6\). To verify, substitute \(x = 6\) back into the original equation: \(x^2 = 12x - 36\).
This gives \(36 = 72 - 36\), which simplifies into \(36 = 36\).
This verification step is simple and gives peace of mind that the solution works, both algebraically and numerically. In cases where you are not confident, always double-check by plugging the solution back into the equation to see if the left-hand side equals the right-hand side.
Graphical Method for Quadratics
Apart from the algebraic route, we can also use graphical methods to solve quadratics. This involves graphing the quadratic equation and finding where it intersects the x-axis, known as the x-intercepts. For our equation \(x^2 - 12x + 36 = 0\), we can plot the curve of \(y = x^2 - 12x + 36\).
Upon graphing, you will notice the parabola touches the x-axis at a single point \(x = 6\).
This point of intersection represents the root of the quadratic equation. With the help of graphing utilities or graph paper, this method confirms our algebraic solution visually. This method acts as a bridge connecting geometric intuition with algebraic precision. Using graphs can be a powerful tool to understand the behavior of quadratics beyond specific solutions.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Use factoring to solve quadratic equation. Check by substitution or by using a graphing utility and identifying \(x\)-intercepts. \(4 x(x+1)=15\)

The formula $$S=2 x^{2}-12 x+82$$ models spending by international travelers to the United States, \(S,\) in billions of dollars, \(x\) years after \(2000 .\) Use this formula to solve. In which years did international travelers spend \(\$ 72\) billion?

The formula $$ N=\frac{t^{2}-t}{2} $$ describes the number of football games, \(N,\) that must be played in a league with t teams if each team is to play every other team once. Use this information to solve Exercises \(80-81\). If a league has 45 games scheduled, how many teams belong to the league, assuming that each team plays every other team once?

In Exercises \(130-133,\) use the \([\mathrm{GRAPH}]\) or \([\mathrm{TABLE}]\) feature of a graphing utility to determine if the polynomial on the left side of each equation has been correctly factored. If the graphs of \(y_{1}\) and \(y_{2}\) coincide, or if their corresponding table values are equal, this means that the polynomial on the left side has been correctly factored. If not, factor the polynomial correctly and then use your graphing utility to verify the factorization. $$x^{2}-6 x+9=(x-3)^{2}$$

Make Sense? In Exercises \(115-118\), determine whether each statement "makes sense" or "does not make sense" and explain your reasoning. Although I can factor the difference of squares and perfect square trinomials using trial-and-error, recognizing these special forms shortens the process.

See all solutions

Recommended explanations on Math Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.