Можете решить? (4m-n)(4m+n)-(4m-n-4)²

Question

Можете решить?
(4m-n)(4m+n)-(4m-n-4)²

Answer 1

16m^2-n^2-(16m^2+(-n)^2+16-8mn-32+8n)
16m^2-n^2-(16m^2+n^2+16-8mn-32m+8n)
16m^2-n^2-16m^2-n^2-16+8mn+32m-8n
-2n^2-16+8mn+32m-8n