Answer
$x^2+10x+21$
Work Step by Step
$(x + 7)(x + 3) $
$=x^2+3x+7x+21$
$=x^2+10x+21$
F.O.I.L.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.4 - Polynomials - Exercise Set - Page 56: 19
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