Match the function with its value
f(x)= x2-3x+3
g(x)= 2x2-1
f(z^2)= .....

There's nothing here to 'match' it with.f(x) = x^2 - 3x + 3f(z^2) = (z^2)^2 - 3z^2 + 3f(z^2) = z^4 - 3z^2 + 3g(x) is only there to confuse you. Apparently it was successful.