Simplify (7m^4+6m^2+7)+(2m^4-3m^2+1)

$(7 m^{4} + 6 m^{2} + 7) + (2 m^{4} - 3 m^{2} + 1)$

Remove parentheses.

$7 m^{4} + 6 m^{2} + 7 + 2 m^{4} - 3 m^{2} + 1$

Add $7 m^{4}$ and $2 m^{4}$ .

$9 m^{4} + 6 m^{2} + 7 - 3 m^{2} + 1$

Subtract $3 m^{2}$ from $6 m^{2}$ .

$9 m^{4} + 3 m^{2} + 7 + 1$

Add $7$ and $1$ .

$9 m^{4} + 3 m^{2} + 8$