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

Chapter 2 - Linear and Quadratic Functions - Section 2.3 Quadratic Functions and Their Zeros - 2.3 Assess Your Understanding - Page 146: 14


the zeros are $x=\pm 3$ and the $x$-intercepts are $(\pm3,0)$.

Work Step by Step

By factorization, we have $$ G(x)=x^2-9=(x-3)(x+3) .$$ That is, we have $x-3=0 $ or $x+3=0$. So the zeros are $x=\pm 3$ and the $x$-intercepts are $(\pm3,0)$.
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