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y+1 = x^2-4x+4
y+1 = (x-2)^2
akar(y+1) = x-2 atau -akar(y+1) = x-2
x= 2+akar(y+1) atau x= 2-akar(y+1)
f^-1(x)= 2+akar(x+1) atau 2-akar(x+1)