+0  
 
+1
211
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-2<3-5x<18

Guest May 24, 2017
 #1
avatar+202 
+1

-2<3-5x<18 <=>plus negative 3 every member: -2-3<-5x<18-3 <=> multiply -1 all membera and {The direction of the relationship changes!!!} : 5>5χ>-15 <=> divide with 5 so 1>x>-3 

Sorry for my english. 

Whitespy001  May 24, 2017
edited by Whitespy001  May 24, 2017
edited by Whitespy001  May 24, 2017
edited by Whitespy001  May 24, 2017
edited by Whitespy001  May 24, 2017
 #2
avatar+7002 
+1

-2 < 3 - 5x < 18

-5 < -5x < 15

-3 < x < 1

 

~The smartest cookie in the world :)

MaxWong  May 24, 2017

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