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 799: 27

Answer

$[-5/4, 3/2]$

Work Step by Step

$(2x-3)(4x+5)\leq0$ $2x-3=0$ $2x=3$ $2x/2 = 3/2$ $x=3/2$ $4x+5=0$ $4x=-5$ $4x/4=-5/4$ $x=-5/4$ (-infinity, $-5/4]$ $[-5/4, 3/2]$ $[3/2$, infinity) Let $x=-2$, $x=0$, $x=3$ $x=-2$ $(2x-3)(4x+5)\leq0$ $(2*-2-3)(4*-2+5)\leq0$ $(-4-3)(-8+5)\leq 0$ $-7*-3 \leq 0$ $21 \leq 0$ (false) $x=0$ $(2x-3)(4x+5)\leq0$ $(2*0-3)(4*0+5)\leq0$ $(0-3)(0+5)\leq 0$ $-3*5\leq 0$ $-15\leq 0$ (true) $x=3$ $(2x-3)(4x+5)\leq0$ $(2*3-3)(4*3+5)\leq0$ $(6-3)(12+5)\leq 0$ $3*17 \leq 0$ $51 \leq 0$ (false)
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