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Sehingga,
a = -2 dan a = 1/2
g(2a^2+3a-5)=-11
3(2a^2+3a-5)-2=-11
6a^2+9a-15=-9
6a^2+9a-6=0 sama sama dibagi dengan 3
2a^2+3a-2=0
(a+2)(2a-1)=0
a=-2 atau a=1/2