Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 10 - Section 10.7 - Partial Fractions - 10.7 Exercises - Page 750: 25

Answer

$\frac{2}{x-2} + \frac{3}{x+2} - \frac{1}{2x-1}$

Work Step by Step

$\frac{9x^2- 9x + 6}{(2x^{3} - x^{2} - 8x + 4)}$ = $\frac{A}{x-2} + \frac{B}{x+2} + \frac{C}{2x-1}$ Factor by grouping : $(x^{2} -4) (2x -1)$ = $(x-2)(x+2)(2x-1)$ Multiply both sides by (x-2) (x+2) (2x-1) $9x^2- 9x + 6 = A(x+2) (2x-1) + B (x-2) (2x-1) + C (x-2) (x+2)$ Substitute x=2 12A = 24 A = 2 Substitute x=-2 20B = 69 B=3 Substitute x= 1/2 -15C/4 = 15/4 C = -1 $\frac{2}{x-2} + \frac{3}{x+2} - \frac{1}{2x-1}$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.