Firsts = 2m×m=2(m^2)

Outsides = 2m×1=2m

Insides = −3×m=−3m

Lasts = −3×1=−3

This gives: 2(m^2)+2m−3m−3

2m and −3m

 are like terms, as they both contain the letter m.

2m−3m=−1m

 which can be written as −m.

Simplifying like terms gives: 2(m^2)−m−3.