Question

(a – b + 6)(a – b – 6) – (a – b)^2

Answer 1

$(a- b + 6)(a - b - 6) - (a - b)^{2}$

$[(a- b) + 6)][(a - b) - 6)] - (a - b)^{2}$

$(a-b)^{2} - 36 - (a - b)^{2}$

-36