WAEC - Mathematics (1993 - No. 12)
Factorize 2x\(^2\) - 21x + 45
(2x - 9)(x - 5)
(2x-15)(x + 3)
(2x +15)(x - 3)
(2x -15(x - 3)
(2x - 9)(x + 5)
Explanation
2x\(^2\) - 21x + 45
= 2x\(^2\) - 15x - 6x + 45
= x(2x - 15) - 3(2x - 15)
= (x - 3)(2x - 15)
2x\(^2\) - 21x + 45
= 2x\(^2\) - 15x - 6x + 45
= x(2x - 15) - 3(2x - 15)
= (x - 3)(2x - 15)