Help with ordering exponents?

Question

Find the missing terms and write them in decreasing order of exponents.
21m^7 − 7m^5 + 49m = 7m(_____+_____+_____ )

Answer 1

Factor out greatest common factor of 7m from each of the factors so:

7m * 3m^6 = 21m^7

7m * -1m^4 = -7m^5 and

7m * 7 = 49m

 

Resulting in 3m^6+-m^4+7

Answer 2

7m(3m^6-m^4+7)