Answer
$[-1,1/2]$
Work Step by Step
Simplify the expression on one side
$2x^2+x-1\leq0$
Identify key numbers by equating to zero
$x=-1$
$x=1/2$
Assign a test value
$[-1,1/2]$
Calculus 8th Edition
by Stewart, James
Published by
Cengage
ISBN 10:
1285740629
ISBN 13:
978-1-28574-062-1
Appendix A - Numbers, Inequalities, and Absolute Values - A Exercises - Page A9: 27
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