Answer
$11$.
Work Step by Step
The given expression is
$=5x^2-9$
Substitute $-2$ for $x$.
$=5(-2)^2-9$
Evaluate the power.
$=5(4)-9$
Multiply.
$=20-9$
Subtract.
$=11$.
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 - Maintaining Mathematical Proficiency - Page 417: 5
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