Ok, i got this equation:

z(z-17)(Z+2)=0

That the manual gives this as an answer: -2, 0, 17.

MY problem, is how do you achieve this. Where do I start. What is the chain of operations.

So far I have tried doing this:

z(z-17)(Z+2)=0

z(z-17)/(Z+2)=0/(z+2)

or

z(z-17)(Z+2)=0

Z^2-17z(Z+2)=0

Z^3+2z^2-17z-34=0

Z^3+2z^2-17z=34

But im block, and im not even sure if im on the right path.

thanks in advanced.