Answer
$b^2+10b+21$.
Work Step by Step
The given expression is
$=(b+3)(b+7)$
Use the FOIL method.
$=b(b)+b(7)+3(b)+3(7)$
Multiply.
$=b^2+7b+3b+21$
Combine like terms.
$=b^2+10b+21$
Hence, the product is $b^2+10b+21$.
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 - 7.2 - Multiplying Polynomials - Exercises - Page 369: 21
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