Question

How do I find the x-intercept of y=x^3+5x^2-4x-20?

Answer 1

You factor and then solve for x for each of them

Answer 2

In this case it factors to (x+2)(x-2)(x+5)

So you do it like this,

x+2=0
x-2=0
x+5=0

x=-2, 2, -5