College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 2 - Functions and Graphs - Exercise Set 2.6 - Page 297: 29


D=(-$\infty$,-2) U (-2,2) U (2,5) U (5,$\infty$)

Work Step by Step

x$^3$-5x$^2$-4x+20$\ne$0 x$^2$(x-5)-4(x-5)$\ne$0 (x$^2$-4)(x-5)$\ne$ (x+2)(x-2)(x-5)$\ne$0 x$\ne$-2, 2, or 5 Therefore, the domain includes all real numbers except -2, 2, and 5.
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.