Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 6 - Review Exercises - Page 479: 31


$$2(x + 3)(x - 3)$$

Work Step by Step

We see from the binomial that we can factor out a $2$ from both terms to simplify it: $$2(x^2 - 9)$$ We see now that we have the difference of two squares, so we use the following formula: $$A^2 - B^2 = (A + B)(A - B)$$ For this binomial, we take the square root of the leading term $(x^2)$ to get $A = x$ and the square root of the second term $(9)$ to get $B = 3$. So we now plug these two values into the formula for factoring the binomial: $$2(x + 3)(x - 3)$$
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