Question

How do you factor `st^2 - st -20s`?

Answer 1

`s(t+4)(t-5)`

Explanation:

Take out s as a common factor s(t^2 -t-20)#

`= s(t^2 -5t+4t-20)`

`=s( t(t-5) +4(t-5) )`

`= s(t+4)(t-5)`