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x2 + 5x - 5 = 0

∴ x2 + 5x + 25/4 = 45/4

∴ (x + 5/2)2 = 45/4

∴ x + 5/2 = ±√(45/4)

∴ x = -5/2 ± 3√(5)/2

∴ x = (-5 ± 3√5)/2

∴ x ∈ {(-5 - 3√5)/2, (-5 + 3√5)/2}

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13y ago

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