Question

(3m+2n+1)(2m-3n+2)

Answer 1

(3m+2n+1)(2m-3n+2)，
=2m(3m+2n+1)-3n(3m+2n+1)+2(3m+2n+1)，
=6m^2+4mn+2m-9mn-6n^2-3n+6m+4n+2，
=6m^2-5mn-6n^2+8m+n+2。