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## Homework Statement

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)

## Homework Equations

I know that the roots are -10, -3+4j and -3-3j.

## 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?