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

1 Answer

Oct 10, 2015

#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)#

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