Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Appendix A - Review - A.6 Rational Expressions - A.6 Assess Your Understanding - Page A54: 79

Answer

$\frac{-2x(x^2-2)}{(x+2)(x^2-x-3)}$

Work Step by Step

1. $\frac{x-2}{x+2}+\frac{x-1}{x+1}=\frac{(x-2)(x+1)+(x-1)(x+2)}{(x+2)(x+1)}=\frac{2x^2-4}{(x+2)(x+1)}=\frac{2(x^2-2)}{(x+2)(x+1)}$ 2. $\frac{x}{x+1}-\frac{2x-3}{x}=\frac{x^2-(2x-3)(x+1)}{x(x+1)}=\frac{-x^2+x+3}{x(x+1)}$ 3. Combine the above $\frac{\frac{x-2}{x+2}+\frac{x-1}{x+1}}{\frac{x}{x+1}-\frac{2x-3}{x}}=\frac{2(x^2-2)}{(x+2)(x+1)}\times\frac{x(x+1)}{-x^2+x+3}=\frac{-2x(x^2-2)}{(x+2)(x^2-x-3)}$
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