Factor s^3-4s^2-9s+36

Math
s3-4s2-9s+36
Factor out the greatest common factor from each group.
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Group the first two terms and the last two terms.
(s3-4s2)-9s+36
Factor out the greatest common factor (GCF) from each group.
s2(s-4)-9(s-4)
s2(s-4)-9(s-4)
Factor the polynomial by factoring out the greatest common factor, s-4.
(s-4)(s2-9)
Rewrite 9 as 32.
(s-4)(s2-32)
Factor.
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Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=s and b=3.
(s-4)((s+3)(s-3))
Remove unnecessary parentheses.
(s-4)(s+3)(s-3)
(s-4)(s+3)(s-3)
Factor s^3-4s^2-9s+36

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