Answer
$(-\infty,-1]\cup[4,\infty)$
Work Step by Step
Rewrite the expression as $x^2-3x-4\geq0$, we can identify it as an inequality. Graph $f(x)=x^2-3x-4$ as shown in the figure and we can find the solution set as $(-\infty,-1]\cup[4,\infty)$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 3 - Polynomial and Rational Functions - Summary Exercises on Solving Equations and Inequalities - Exercises - Page 383: 14
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