Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 7 - Section 7.4 - Adding and Subtracting Rational Expressions with Different Denominators - Exercise Set: 29

Answer

$\frac{9x^{4}-4x^{2}}{21}$

Work Step by Step

Step 1: $\frac{3x^{4}}{7}-\frac{4x^{2}}{21}$ Step 2: $\frac{3x^{4}\times3}{7\times3}-\frac{4x^{2}\times1}{21\times1}$ Step 3: $\frac{9x^{4}}{21}-\frac{4x^{2}}{21}$ Step 4: $\frac{9x^{4}-4x^{2}}{21}$ Step 5: No further simplification possible, so the answer is $\frac{9x^{4}-4x^{2}}{21}$
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