JAMB - Mathematics (1991 - No. 18)
Factorize 1 - (a - b)2
(1 - a - b)(1 - a + b)
(1 + a - b)(1 - a + b)
(1 - a + b)(1 - a + b)
(1 + a + b)(1 + a + b)
Förklaring
1 - (a - b)2 = [1 + (a - b)][1 - a + b]
= (1 + a - b)(1 - a + b)
= (1 + a - b)(1 - a + b)