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21x^2-2x-3. Factor by grouping (ac method)
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21x^2-2x-3. Factor by grouping (ac method)

User Milen Dyankov
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8.1k points

1 Answer

1 vote
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)
User Whostolebenfrog
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