Question 72891
You can look at the roots and accurately guess the equation. If the roots are x=2, x=3 and x=5, then your equation will be (x-2)(x-3)(x-5) which will turn into a long and nasty polynomial of degree 3 (which I don't want to write out). So look at the roots and know the fact that if the root is x=a then the factor is (x-a). However, this does not help all the time (it will in your case) since not all of the zeros will be real, but that's for another day.