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f(g(x+1))=2(g(x+1))+1=-2x^2-4x-1
2(g(x+1))=-2x^2-4x-2
G(X+1)= -x^2-2x-1
Utk X=x-1
g(x)=-(x-1)^2-2(x-1)-1
g(x)=-(x^2-2x+1)-2x+2-1
g(x)=-x^2+2x-1-2x+1
g(x)=-x^2
g(x)=y
-y=x^2
Akar(-y)=x
g(x)^-1= akar(-x)
g(-2)^-1= akar (2)
Utk