JAMB - Mathematics (1984 - No. 15)
Factorize 6x2 - 14x - 12
2(x + 3)(3x - 2)
6(x - 2)(x + 1)
2(x - 3)(3x + 2)
6(x + 2)(x - 1)
(3x - 4)(2x + 3)
解释
6x2 - 14x - 12 = 6x2 - 18x + 4x - 12
(3x + 2)(2x - 6)
= 3x(2x - 6) + 2(2x - 6)
= (3x + 2) 2(x - 3)
(3x + 2)(2x - 6)
= 3x(2x - 6) + 2(2x - 6)
= (3x + 2) 2(x - 3)