Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 7 - Algebraic Fractions - 7.1 - Simplifying Algebraic Fractions - Problem Set 7.1: 58

Answer

$-\frac{3}{4}$

Work Step by Step

We factor the expressions in order to cancel out common factors in the numerator and the denominator: Step 1: $\frac{3x-21}{28-4x}$ Step 2: $\frac{3(x-7)}{-4(x-7)}$ Step 3: $\frac{3}{-4}$ Step 4: $-\frac{3}{4}$
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