S square - 2 s - 399
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s² - 2s - 399
= s² - 21s + 19s - 399
= s(s-21) + 19 (s-21)
= (s-21)(s+19)
= s² - 21s + 19s - 399
= s(s-21) + 19 (s-21)
= (s-21)(s+19)
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