Answer
$-\frac{3}{y^{4}}$
Work Step by Step
$\frac{6}{5y^{4}}-\frac{21}{5y^{4}}=\frac{6-21}{5y^{4}}=\frac{-15}{5y^{4}}=\frac{-15\div5}{5y^{4}\div5}=-\frac{3}{y^{4}}$
Intermediate Algebra (12th Edition)
by Lial, Margaret L.; Hornsby, John; McGinnis, Terry
Published by
Pearson
ISBN 10:
0321969359
ISBN 13:
978-0-32196-935-4
Chapter 6 - Section 6.2 - Adding and Subtracting Rational Expressions - 6.2 Exercises - Page 382: 14
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