Question

What are the zeros of the polynomial function

f(x) = x^3 + x^2 - 20x

choices:
0, -5, -4
0, -5, 4
0, 5, -4
0, 5, 4

Answer 1

(b) 0,-5,4

Explanation:

`f(x)=x^3+x^2-20x\\x^3+x^2-20x=0\\x(x^2+x-20)=0\\x(x+5)(x-4)=0\\x=0, x+5=0, x-4=0\\x=0,x=-5,x=4`