Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 6 - Factoring, Solving Equations, and Problem Solving - 6.2 - Factoring the Difference of Two Squares - Problem Set 6.2 - Page 248: 50


The solution set is $\left\{-\frac{3}{2}, \frac{3}{2}\right\}$.

Work Step by Step

Add $-9$ to both sides to obtain: $4x^2-9=0 \\(2x)^2-3^2=0$ RECALL: A difference of two squares can be factored using the formula: $a^2-b^2=(a-b)(a+b)$ Factor the difference of two squares to obtain: $(2x-3)(2x+3)=0$ Equate each factor to 0, and then solve each equation to obtain: $2x-3=0 \text{ or } 2x+3 = 0 \\2x=3 \text{ or } 2x=-3 \\x=\frac{3}{2} \text{ or } x=-\frac{3}{2}$ The solution set is $\left\{-\frac{3}{2}, \frac{3}{2}\right\}$.
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