Answer
$3$
Work Step by Step
The given expression is
$=3x^2-9$
Substitute $-2$ for $x$.
$=3(-2)^2-9$
Simplify.
$=3(4)-9$
$=12-9$
$=3$
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 8 - Graphing Quadratic Functions - 8.1 - Graphing f(x) = ax^2 - Exercises - Page 424: 33
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