Anyone
which functions have real zeros at 1 and 4? check all that apply.
a f(x) = x^2 + x + 4
b f(x) = x^2 – 5x + 4
c f(x) = x^2 + 3x – 4
d f(x) = –2x^2 + 10x – 8
e f(x) = –4x^2 – 16x – 1