I don't know what you mean by "Factor R on Factor S" but this is the way I would solve it:
\text{Let the roots be }a,\,b,\text{ and }c\text{. It is given that }a = b + c
\begin{align*}\\\text{By the sum of roots: }\\a + b + c &= \frac{-32}{4} = -8\\2a&= -8\\a &= -4 \end{align*}...