Answer
$x^2+10x+21$
Work Step by Step
$$(x+7)(x+3)$$ $$=(x\times x)+(x\times 3)+(7\times x)+(7\times 3)$$ $$=x^2+3x+7x+21$$ $$=x^2+10x+21$$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter P - Prerequisites: Fundamental Concepts of Algebra - Exercise Set P.4 - Page 61: 19
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