Please help me, How to factorise this polynomial...
$\displaystyle D^5-13D^3+26D^2+82D+104=0$
Thanks in advance...
Find the positive and negative factors of $\displaystyle 104$.
Then substitute each of these into the polynomial.
If any of them (call it $\displaystyle a$) gives you $\displaystyle 0$ after simplifying the left hand side, then $\displaystyle (x - a)$ is a factor.
After you've done that, long divide, follow the same process.