Answer
$9a^2-30a+25$
Work Step by Step
RECALL:
$(x-y) ^2=x^2 -2xy +y^2$
Use the rule above to obtain:
$=(3a)^2-2(3a)(5) + 5^2
\\=9a^2-30a+25$
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: 27
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