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Factor completely 9x^21+9x-4
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Factor completely 9x^21+9x-4

User DouglasHeriot
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Hi,

9x² + 9x -- 4 = 9x² + 12x -- 3x -- 4 = 9x² -- 3x + 12x -- 4 =
= 3x(3x -- 1) + 4(3x -- 1) = (3x -- 1)(3x + 4).

Green eyes.
User Xrobau
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