Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Appendix A - Review - A.3 Polynomials - A.3 Assess Your Understanding - Page A31: 74



Work Step by Step

Recall the difference of two squares formula: $(a-b)(a+b)=a^2-b^2$ By applying this formula, we get: $$ (5x - 3)(5x + 3)=(5x)^2-3^2=25x^2-9 .$$
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