s²-k²-4s+4=
(s²-4s+4) - k²=
(s-2)² - k²=
(s-2-k)(s-2+k)
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s²-k²-4s+4=
(s²-4s+4) - k²=
(s-2)² - k²=
(s-2-k)(s-2+k)