Answer:
a. m²-4m
b. 2m²+7m
c. 9m³
Step-by-step explanation:
First, identify the variables that have the same exponent. Look at their coefficients then proceed with calculating.
like for a.) m and -5m have the same variable m. Looking at their coefficients 1 and -5 and adding them will result to -4, which is the new coefficient of m.
