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: 34

Answer

$(-5, 3/2)$ U $(4$, infinity)

Work Step by Step

$(3x-12)(x+5)(2x-3)\geq0$ $3x-12=0$ $3x=12$ $3x/3=12/3$ $x=4$ $x+5=0$ $x=-5$ $2x-3=0$ $2x=3$ $2x/2=3/2$ $x=3/2$ (-infinity, $-5)$ $(-5, 3/2)$ $(3/2, 4)$ $(4$, infinity) Let $x=-10$, $x=0$, $x=2$, $x=10$ $x=-10$ $(3x-12)(x+5)(2x-3)\geq0$ $(3*-10-12)(-10+5)(2*-10-3)\geq0$ $(-30-12)(-5)(-20-3)\geq0$ $(-42)(-5)(-23)\geq0$ $-4830 \geq0$ (false) $x=0$ $(3x-12)(x+5)(2x-3)\geq0$ $(3*0-12)(0+5)(2*0-3)\geq0$ $(-12)(5)(-3)\geq0$ $180 \geq 0$ (true) $x=2$ $(3x-12)(x+5)(2x-3)\geq0$ $(3*2-12)(2+5)(2*2-3)\geq0$ $(6-12)(7)(4-3)\geq0$ $-6*7*1\geq 0$ $-42 \geq 0$ (false) $x=10$ $(3x-12)(x+5)(2x-3)\geq0$ $(3*10-12)(10+5)(2*10-3)\geq0$ $(30-12)(15)(20-3)\geq0$ $18*15*17\geq 0$ $4590 \geq 0$ (true)
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