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1/2log(x^2+2x)< 1/2 log 1/2^-3
x^2+2x<8
x^2+2x-8<0
-----kuadrat pembuat nol-----
x^2+2x-8=0
(x+4) (x-2)=0
x+4=0, X=-4 V x-2=0, X=2
jadi hp {x|-4<x<2, X∈R}