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x2 + 8x - 5 = 0

∴ x2 + 8x + 16 = 21

∴ (x + 4)2 = 21

∴ x + 4 = ± √21

∴ x = -4 ± √21

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14y ago
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Q: The quadratic formula x2 plus 8x - 5 equals 0?
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