Answer
$4a^2+28a+49$
Work Step by Step
RECALL:
$(x+y) ^2=x^2 +2xy +y^2$
Use the formula above where $x=2a$ and $y=7$ to obtain:
$=(2a)^2+2(2a)(7) +7^2
\\=4a^2+28a+49$
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 5 - Exponents and Polynomials - Chapter 5 Review Problem Set - Page 231: 33
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