Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 11 - Section 11.4 - The Binomial Theorem - Exercise Set - Page 866: 86

Answer

The answer is $=\frac{2x^2-9x-1}{2(x-4)(x+3)}$.

Work Step by Step

The given expression is $\frac{x}{x+3}-\frac{x+1}{2x^2-2x-24}$ Factor denominator of the second term. $=2x^2-2x-24$ $=2(x^2-x-12)$ $=2(x^2-4x+3x-12)$ $=2[x(x-4)+3(x-4)]$ $=2(x-4)(x+3)$ Substitute into the expression. $=\frac{x}{x+3}-\frac{x+1}{2(x-4)(x+3)}$ Make both term's denominator equal to least common factor $2(x-4)(x+3)$. $=\frac{x}{x+3}\cdot \frac{2(x-4)}{2(x-4)}-\frac{x+1}{2(x-4)(x+3)}$ $=\frac{2x(x-4)}{2(x-4)(x+3)}-\frac{x+1}{2(x-4)(x+3)}$ Now subtract both numerator. $=\frac{2x(x-4)-(x+1)}{2(x-4)(x+3)}$ $=\frac{2x^2-8x-x-1}{2(x-4)(x+3)}$ $=\frac{2x^2-9x-1}{2(x-4)(x+3)}$.
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