Algebra factorise

Question

(a - b)^2 - (c - d)^2 and factorise fully

(a - b)^2 - (c + d)^2

Answer 1

Both of the expressions are differences of squares. So they are equal to

1)(a-b+c-d)(a-b-c+d)

2)(a-b+c+d)(a-b-c-d).