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
Açıklama
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
x2 - 2x - 8 = 0
(x2 - 4x) + (2x - 8) = 0
When x + 2 = 0
x = -2, when x - 4 = 0
x = 4
-2 or 4