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Mathematics
25 May, 23:53
21x^2-2x-3. Factor by grouping (ac method)
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Juliana Odonnell
26 May, 00:13
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Rewrite - 2x into 7x-9x
21x^2+7x-9x-3
group the first two terms, then group the last two terms: (21x^2+7x) - (9x+3)
7x (3x+1) - 3 (3x+1)
so (3x+1) (7x-3)
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