Answer
$64-9a^2$.
Work Step by Step
The given expression is
$=(8+3a)(8-3a)$
Use sum and difference pattern $(a+b)(a-b)=a^2-b^2$.
We have $a=8$ and $b=3a$.
$=(8)^2-(3a)^2$
Simplify.
$=64-9a^2$
Hence, the product is $64-9a^2$.
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 7 - Polynomial Equations and Factoring - 7.3 - Special Products of Polynomials - Exercises - Page 375: 19
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