Answer
$21x^2+19x+4$
Work Step by Step
$$(7x+4)(3x+1)$$ $$=(7x\times 3x)+(7x\times 1)+(4\times 3x)+(4\times 1)$$ $$=21x^2+7x+12x+4$$ $$=21x^2+19x+4$$
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: 24
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