For the polynomial function f(x) = x4 + 3x³ - x² – 3x we have
(-3) = 0, f(-2) = -6, f(-1) = 0, f(0) = 0, f(1) = 0, ƒ(2) = 30, f(3) = 144. Rewrite
f(x) as a product of linear factors.