WAEC - Mathematics (1989 - No. 43)
Solve for x: (x2 + 2x + 1) = 25
-6, -4
6, -4
6, 4
-6, 4
5, 5
Vysvětlení
x2 + 2x + 1 = 25
x2 + 6x - 4x -24= 0
x(x + 6) - 4(x + 6) = 0
(x - 4) - (x + 6) = 0
x = 4 or -6 = -6,4
x2 + 6x - 4x -24= 0
x(x + 6) - 4(x + 6) = 0
(x - 4) - (x + 6) = 0
x = 4 or -6 = -6,4