Упростите (m-4n+5z) ^2-(3m-n-3r) ^2

Question

Упростите (m-4n+5z) ^2-(3m-n-3r) ^2

Answer 1

(m-4n+5z)^2-(3m-n-3r)^2 = -8m^2+15n^2+25z^2-2mn+10mz-40nz-9r^2+18mr-6nr.