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: 33

Answer

(-infinity, $-4)$ U $(4,6)$

Work Step by Step

$(2x-8)(x+4)(x-6)\leq0$ $2x-8=0$ $2x=8$ $2x/2=8/2$ $x=4$ $x+4=0$ $x=-4$ $x-6=0$ $x=6$ (-infinity, $-4)$ $(-4, 4)$ $(4,6)$ $(6$, infinity) Let $x=-10$, $x=0$, $x=5$, $x=10$ $x=-10$ $(2x-8)(x+4)(x-6)\leq0$ $(2*-10-8)(-10+4)(-10-6)\leq0$ $(-20-8)(-6)(-16)\leq0$ $(-28)(96)\leq0$ $-2688 \leq 0$ (true) $x=0$ $(2x-8)(x+4)(x-6)\leq0$ $(2*0-8)(0+4)(0-6)\leq0$ $(0-8)*4*-6\leq 0$ $-8*-24\leq0$ $192 \leq 0$ (false) $x=5$ $(2x-8)(x+4)(x-6)\leq0$ $(2*5-8)(5+4)(5-6)\leq0$ $(10-8)*9*-1\leq 0$ $2*-9 \leq 0$ $-18 \leq 0$ (true) $x=10$ $(2x-8)(x+4)(x-6)\leq0$ $(2*10-8)(10+4)(10-6)\leq0$ $(20-8)*14*4\leq 0$ $12*14*4 \leq 0$ $672 \leq 0$ (false)
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