Write y = 2x2 + 4 in function notation.
Af(x) = 2x2 + 4
Bf(y) = 2x2 + 4
Cf(y) = 2y2 + 4
Df(x) = 2y2 + 4
Af(x) = 2x2 + 4
Bf(y) = 2x2 + 4
Cf(y) = 2y2 + 4
Df(x) = 2y2 + 4