Answer
a. $x^2+15x+50$
b. $12x^2-x-20$
Work Step by Step
a.
$(x+5)(x+10)$
$=x(x+10)+5(x+10)$
$=x^2+10x+5x+50$
$=x^2+15x+50$
b.
$(4x+5)(3x-4)$
$=4x(3x-4)+5(3x-4)$
$=12x^2-16x+15x-20$
$=12x^2-x-20$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Section 5.5 - Multiplying Polynomials - Practice - Page 376: 7
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