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|2x+7|<11
(2x+7)^2<11^2
(2x+7+11)(2x+7-11)
(2x+18) (2x-4)
2x=-18. 2x=4
x=-18/2. x=4/2
x=-9. x=2
HP={ 2<x<9 }
no.1
|2x-1|=|2-3x|
(2x-1)^2 = (2-3x)^2
(2x-1)^2 - (2-3x)^2 =0
[(2x-1)+(2-3x)] [(2x-1)-(2-3x)] =0
(-x+1) (5x-3) *dikelompokkan variable x nya.
-x=-1. 5x=3
x=1. x=3/5