3s^2+9s-7s-21
3s(s+3)-7(s+3)
So your answer is
(3s-7)(s+3)
Grouping?
(3s-7)(s+3) = 0
s= -3, 7/3
=D
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Verified answer
3s^2+9s-7s-21
3s(s+3)-7(s+3)
So your answer is
(3s-7)(s+3)
Grouping?
(3s-7)(s+3) = 0
s= -3, 7/3
=D