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: 49

Answer

(-infinity, $-5/3)$ U $(7/2$, infinity)

Work Step by Step

$(2x-7)(3x+5)>0$ $(2x-7)(3x+5)=0$ $2x-7=0$ $2x=7$ $2x/2=7/2$ $x=7/2$ $3x+5=0$ $3x=-5$ $3x/3=-5/3$ $x=-5/3$ (-infinity, $-5/3)$ $(-5/3, 7/2)$ $(7/2$, infinity) Let $x=-3$, $x=0$, $x=10$ $x=-3$ $(2x-7)(3x+5)>0$ $(2*-3-7)(3*-3+5)>0$ $(-6-7)(-9+5)>0$ $-13*-4>0$ $52 >0$ (true) $x=0$ $(2x-7)(3x+5)>0$ $(2*0-7)(3*0+5)>0$ $(0-7)(0+5)>0$ $-7*5>0$ $-35>0$ (false) $x=10$ $(2x-7)(3x+5)>0$ $(2*10-7)(3*10+5)>0$ $(20-7)(30+5)>0$ $13*35>0$ $455 >0$ (true)
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