Question

4(1+a)2-4(1+a)(b-1)+(b-1)2

Answer 1

[4(1) + 4(a)] 2 - [4(1) + 4(a)] (b-1) + (b-1)2
(4 + 4a) 2 - (4 + 4a) (b-1) + (b-1) 2
(4 + 4a) 2 - (4b -4 +4ab -4a) + (b-1) 2
8 + 8a - 4b -4 +4ab -4a +2b -2
4a -2b +4ab +2