Originally Posted by
moomoo762 Using the rational root test I got 7
I know the other two sides are 8 and 9 but how do I go about finding them?
first of all, correct your expansion ...
you know 7 is a root ... use synthetic division
Code:
7] 1.......3........2.......-504
............7.......70........504
-------------------------------
....1......10.......72.........0
note the coefficients of the depressed polynomial ...
since , the other two roots are imaginary.
is the only real root
go back to the original equation ...