JAMB - Mathematics (1979 - No. 10)

The solution of the equation x2 - 2x = 8 is
x = 0 or 2
x = -2 or 4
x = 2
x = -4
x = 2 or 4

Explanation

x2 - 2x = 8 = 8

x2 - 2x - 8 = 0

(x2 - 4x) + (2x - 8) = 0

When x + 2 = 0

x = -2, when x - 4 = 0

x = 4

-2 or 4

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