Question

Which function is not quadratic?

a)f(x)=x(x-3)(-6x+5)
b)f(x)=-6(x-2)^2
c)f(x)=-3x^2+5
d)f(x)=(-6x+3)(1/2x-3)

Answer 1

(a) has three factors, so it will be a cubic, not a quadratic.