Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 11 - Section 11.4 - Nonlinear Inequalities in One Variable - Exercise Set - Page 798: 23

Answer

$[0, 2]$ U $[3, ∞)$

Work Step by Step

$(x^2+6)/5x \geq1$ Denominator is zero when $x=0$ $(x^2+6)/5x \geq1$ $(x^2+6)*5x/5x \geq1*5x$ $x^2+6 \geq 5x$ $x^2-5x+6 \geq 0$ $(x-2)(x-3) \geq 0$ $x-2=0$ $x=2$ $x-3=0$ $x=3$ $(-∞, 0]$ $[0, 2]$ $[2, 3]$ $[3, ∞)$ Let $x=-1$, $x=1$, $x=2.5$, $x=6$ $x=-1$ $((-1)^2+6)/5(-1) \geq1$ $(1+6)/-5 \geq1$ $7/-5 \geq 1$ (false) $x=1$ $(x^2+6)/5x \geq1$ $(1^2+6)/5*1 \geq1$ $(1+6)/5 \geq1$ $7/5 \geq 1$ (true) $x=2.5$ $(x^2+6)/5x \geq1$ $(2.5^2+6)/5*2.5 \geq1$ $(6.25+6)/12.5 \geq 1$ $(12.25)/12.5 \geq 1$ $.98 \geq 1$ (false) $x=6$ $(x^2+6)/5x \geq1$ $(6^2+6)/5*6 \geq1$ $(36+6)/30\geq 1$ $42/30 \geq 1$ $7/5 \geq 1$ (true)
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