Find the factors.
s2 – 2s – 399
s2 – 2s – 399
⟹ s2 – 21s + 19s – 399
⟹ s(s – 21) + 19(s – 21)
⟹ (s – 21) (y + 19)
So (s – 21) and (s + 19) are the factors of the given polynomial.
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