given f(x)= -x^3 +7x^2 -9x -5 and that x = 5 is a root,

Question

 find the other roots

Answer 1

It was already given that x = 5 one root

We can write it as

So we get x = 5 is one root and the roots for can be find out by for imaginary roots

Take out 2 common

Cancel 2 on numerator and denominator

So the other roots are .