Упростите: (a+b-c)^2-(a-b-c)^2

Question

Упростите:

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

Answer 1

(a+b-c)^2-(a-b-c)^2 = ((a+b-c)-(a-b-c))((a+b-c) + (a-b-c))=   (a+b-c-a+b+c)(a+b-c + a-b-c)=  b^2 * a^2