Diketahui fungsi f(x)=x²+2x-1 dan g(x)=3x+2.

A. (g o f) (x)
=g(f(x))
=g(x²+2x-1)
=3(x²+2x-1)+2
=3x²+6x-3+2
=3x²+6x-1

b. (f o g) (x)
=f(g(x))
=f(3x+2)
=(3x+2)²+2(3x+2)-1
=9x²+12x+4 + 6x+4 -1
=9x²+18x+7