Simplify (-5n^4+8)+(5n^4+8n^3+3n^2)

$(- 5 n^{4} + 8) + (5 n^{4} + 8 n^{3} + 3 n^{2})$

Remove parentheses.

$- 5 n^{4} + 8 + 5 n^{4} + 8 n^{3} + 3 n^{2}$

Combine the opposite terms in $- 5 n^{4} + 8 + 5 n^{4} + 8 n^{3} + 3 n^{2}$ .

Add $- 5 n^{4}$ and $5 n^{4}$ .

$0 + 8 + 8 n^{3} + 3 n^{2}$

Add $0$ and $8$ .

$8 + 8 n^{3} + 3 n^{2}$

Move $8$ .

$8 n^{3} + 3 n^{2} + 8$