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x2 - 8x - 40 = 0

∴ x2 - 8x = 40

∴ x2 - 8x + 16 = 56

∴ (x - 4)2 = 56

∴ x - 4 = ± 561/2

∴ x = 4 ± 561/2

∴ x = 4 ± 2 × 141/2

∴ x ≈ {11.4833, -3.4833}

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Q: How would you solve the equation x² plus 8x-40 equals 0?
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