Question

4m4 - 8m3 - 7m) + (4m4 - 7m2 - 5m

Answer 1

Answer:

8m^4  -8m^3  -7m^2 -12 m

Step-by-step explanation:

(4m^4 - 8m^3 - 7m) + (4m^4 - 7m^2 - 5m)

I like to line them up vertically.  I put 0 in the spots to keep them lined up

4m^4 - 8m^3  +0m^2  -7m

+4m^4 +0m^3 - 7m^2 - 5m

--------------------------------------------

8m^4  -8m^3  -7m^2 -12 m

Answer 2

$(4m^4-8m^3-7m)+(4m^4-7m^2-5m)\\\\=4m^4-8m^3-7m+4m^4-7m^2-5m\qquad\text{combine like terms}\\\\=(4m^4+4m^4)-8m^3-7m^2+(-7m-5m)\\\\=\boxed{8m^4-8m^3-7m^2-12m}$