Question

（m-2n-p)(m-2n+p)-(m+2n+p)(m+2n+p)

Answer 1

（m-2n-p)(m-2n+p)-(m+2n+p)(m+2n+p)

=[（m-2n）-p][(m-2n)+p]-[(m+2n)+p][(m+2n) +p]

=(m-2n)^2-p^2-(m+2n)^2-2(m+2n)p-p^2

=-8mn-2(m+2n)p-2p^2

=-8mn-2mp-4np-2p^2

=-2(p+m)(p+2n)-4mn