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-4x2 plus 6x plus 40 equals 0?

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โˆ™ 2010-05-20 20:36:47

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-4x2 + 6x + 40 = 0

∴ -2x2 + 3x + 20 = 0

∴ -2x2 - 8x + 5x + 20 = 0

∴ -2x(x + 4) + 5(x + 4) = 0

∴ (5 - 2x)(x + 4) = 0

∴ x ∈ {5/2, -4}

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โˆ™ 2010-05-20 20:36:47
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