WAEC - Mathematics (1989 - No. 6)
Factorize 35 - 2b - b2
(35-2b)(b-1)
(7+b)(5-b)
(3+7b)(5-b)
(35-b)(3b+7)
(7+b)(5+b)
Vysvetlenie
35 - 2b - b 2;
35 - 7b + 5b - b 2
7(5 - b) + 5(5 - b)
(7 + b)(5 - b)
35 - 7b + 5b - b 2
7(5 - b) + 5(5 - b)
(7 + b)(5 - b)