Answer
$\dfrac{3}{x^3}$
Work Step by Step
The given expression, $
\dfrac{5}{4x^3}+\dfrac{7}{4x^3}
,$ simplifies to
\begin{array}{l}\require{cancel}
\dfrac{5+7}{4x^3}
\\\\=
\dfrac{12}{4x^3}
\\\\=
\dfrac{3}{x^3}
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 6 - Test - Page 406: 7
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