1. The problem statement, all variables and given/known data As part of a control engineering problem, I need to factorise this polynomial. s^3 + 16s^2 + 85s + 250 (EDIT: the images failed so had to write it in this form) 2. Relevant equations I know that the roots are -10, -3+4j and -3-3j. 3. The attempt at a solution I'm not quite sure where to begin with this. Should i guess a factor and attempt long division to see if it is one? or what should i do?