Answer
$63$.
Work Step by Step
The given polynomial is
$= 12^2-9^2$
Use difference of two square pattern
$a^2-b^2=(a+b)(a-b)$.
We have $a=12$ and $b=9$.
$= (12+9)(12-9)$
Simplify.
$= (21)(3)$
Multiply.
$= 63$
Hence, the solution is $63$.
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 - 7.7 - Factoring Special Products - Exercises - Page 401: 9
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