bantuin sama caranya

f(g(x)) = x²+2x-5
f(x-3) = x²+2x-5
a=x-3...x=a+3
f(a)=(a+3)²+2(a+3)-5
=a²+6a+9+2a+6-5
=a²+8a+10
maka
f(x) = x²+8x+10