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f(x+3)=x^2+3x-2
misal y= x+3
x=y-3
f(y)=(y-3)^2+3(y-3)-2=y^2-6y+9+3y-9-2=y^2-3y-2
jdi f(x)=x^2-3x-2
sehingga f(x-2)= (x-2)^2-3(x-2)-2=x^2-4x+4-3x+6-2=x^2-7x+4