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

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Answer 1 · 2015-10-10T08:26:52

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

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

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

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

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

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