Question

(a+b+c)(b+c-a)(c+a-b)(a+b-c)

Answer 1

(a+b+c)(b+c-a)(c+a-b)(a+b-c)

a+b+c+b+c-a+c+a-b+a+b-c

a+a+b+b+c+c(as there were some

variables which had to be cancelled)

2a+2b+2c

2(a+b+c)