Well, my question is how.
Here's one from the sheet, I have the answers already, but everyone knows the answers don't matter in math >.>
If you think these are both done with a pretty similar method, then you don't have to show me both. They just look different.
By solving for the zeros of the polynomials I can tell you that
You can get this by setting and putting the factors in terms of where are the zeros of the polynomial.