WAEC - Mathematics (1995 - No. 16)
Solve the equation (x +2)(x - 7) = 0
x = 1 or 8
x = -2 or 7
x = -4 or 5
x = -3 or 6
x= -5 or -2
Wyjaśnienie
(x + 2)(x - 7) = 0
x + 2 = 0 \(\implies\) x = -2
x - 7 = 0 \(\implies\) x = 7
x = -2 or 7
(x + 2)(x - 7) = 0
x + 2 = 0 \(\implies\) x = -2
x - 7 = 0 \(\implies\) x = 7
x = -2 or 7