Answer
$x=\pm 3$
Work Step by Step
The graphs of $y=x^2$ and $y=9$ intersect at $x=-3$ and $x=3$.
It is because intersection means equating their expressions and $x^2=9$ equation simply provides the solutions $x=-3$ and $x=3$.
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 9 - Solving Quadratic Equations - 9.3 - Solving Quadratic Equations Using Square Roots - Exercises - Page 502: 39
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