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X2 plus 4x - 9 equals 5x plus 3?

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โˆ™ 2010-01-17 18:09:12

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x2 + 4x - 9 = 5x + 3

∴ x2 - x - 12 = 0

∴ (x + 3)(x - 4) = 0

∴ x ∈ {-3, 4}

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โˆ™ 2010-01-17 18:09:12
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