Answer:
-4m^3+5m^2+7m-15
Step-by-step explanation:
To evaluate this, we open the brackets and collect like terms.
[(6m^2 + 3m -6)] - (4m^3 -5m +9)- (m^2+m)]
Opening the brackets(note; we multiply the elements in each of the brackets by the sign in front of the bracket) we have;
6m^2+3m-6 -4m^3+5m-9 -m^2-m
We collect like terms;
-4m^3+6m^2-m^2+3m+5m-m-6-9
-4m^3+5m^2+7m-15
Kindly note 6m^2 is same as 6 raised to the power of 2
