Simplify -6m^2n^2+3mn+4mn+13m^2n^2+9

$- 6 m^{2} n^{2} + 3 m n + 4 m n + 13 m^{2} n^{2} + 9$

Step 1

Add $- 6 m^{2} n^{2}$ and $13 m^{2} n^{2}$ .

$7 m^{2} n^{2} + 3 m n + 4 m n + 9$

Step 2

Add $3 m n$ and $4 m n$ .

$7 m^{2} n^{2} + 7 m n + 9$