Question

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

Answer 1

((2 • (ab - cd) - a2) - b2) + c2) + d2

-a2+2ab-b2+c2-2cd+d2

-a2 + 2ab - b2 + c2 - 2cd + d2

Answer 2

Here is ur answer buddy