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: 47


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

Work Step by Step

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