Question

What are the roots of x^3-x^2-15x-25=0?? How did you get the answer??

Answer 1

Are you supposed to use a particular method to solve it?

Answer 2

First, we notice that 5 is a solution because 5^3-5^2-15*5-25=0.

Answer 3

So (x-5) is a factor of x^3-x^2-15x-25.

Answer 4

Then we can apply the long division to find the other factor whose degree is 2.