Set up the following addition using a vertical format and find the sum of the given polynomials. 2mn + 4n2 and 5m2 - 7mn

5 m2 + 5 mn - 4 n2
5 m2 - 14 mn - 4 n2
9 m2 + 9 mn - 4 n2
5 m2 - 5 mn + 4 n2

if you explain the the question more correctly i might be able to answer this better

step-by-step explanation:

1.3

step-by-step explanation:

3x2=6   9x+6

bring down the 6 on both sides

6+6=12

12= 9x

divide by 9

12/9 =

1.3 =x

ummm seems that u didnt post the attachement !