Question 1183005
90 is  2*3*3*5.


To find all possible roots according to the theorem, 


Plus and minus of :
90/2, 45/2, 18/2, 15/2, 10/2, 9/2, 5/2, 3/2, 2/2, 6/2
which are
45, 45/2, 9, 15/2, 5, 9/2, 5/2, 3/2, 1/2, 3


and the plus and minus of :
90, 45, 18, 15, 10, 9, 5, 3, 2,  1, 6