Answer
6$m^{4}$ - 2$m^{3}$ - 7$m^{2}$ - 4m
Work Step by Step
1. Group like terms together.
(6$m^{4}$ - 3$m^{2}$ + m) - (2$m^{3}$ + 5$m^{2}$ + 4m) + ($m^{2}$ - m)
= 6$m^{4}$ - 2$m^{3}$ + (-3$m^{2}$ - 5$m^{2}$ + $m^{2}$) + (m - 4m - m)
2. Add like terms.
6$m^{4}$ - 2$m^{3}$ - 7$m^{2}$ - 4m