Question

What are the zeros of the polynomial function f(x) = x^3 + x^2 - 20x?

Answer 1

@phi 0, -5, -4 right?

Answer 2

I would factor out an x
x ( x^2 +x -20)
then factor the quadratic
x ( x+5) (x-4)

that has zeros at x=0, -5 and 4

Answer 3

Ohh ok thanks for explaining that!

Answer 4

or you could try each choice in the original equation to see if you get 0