(2s - t)(s + 2t)
(2s + t)(s - 2t)
(s + t)(2s - 1)
(2s + t)(s -t)
(2s + t)(s + 2t)
Correct answer is B
2s2 - 3st - 2t2
= 2s2 - 4st + st - 2t2
= 2s(s - 2t) + t(s - 2t)
= (2s + t)(s - 2t)
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