Calculus with Applications (10th Edition)

Published by Pearson
ISBN 10: 0321749006
ISBN 13: 978-0-32174-900-0

Chapter R - Algebra Reference - R.5 Inequalities - R.5 Exercises - Page R-21: 34

Answer

$10r^2+r\leq2$ $10r^2+r-2\leq0$ $(5r-2)(2r+1)\leq0$ $\frac{-1}{2}\leq r \leq\frac{2}{5}$
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Work Step by Step

Step 1: Subtract 2 from both sides of the inequality Step 2: Factorize trinomial inequality Step 3: The quadratic inequality is smaller than and equal to $0$ for $\frac{-1}{2}\leq r \leq\frac{2}{5}$
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