Упростите выражение)(2m-3n)(5m+n)-10(m+n)²

Question

Упростите выражение)
(2m-3n)(5m+n)-10(m+n)²

Answer 1

=(10m+2mn-15mn-3mn)-10(m^2+2mn+n^2)=10m+2mn-15mn-3mn-10m^2-20mn-n^2=-36mn+10m-10m^2-n^2