Simplify (6x+4x^4)+(7x+3x^4-8)

$(6 x + 4 x^{4}) + (7 x + 3 x^{4} - 8)$

Remove parentheses.

$6 x + 4 x^{4} + 7 x + 3 x^{4} - 8$

Add $6 x$ and $7 x$ .

$4 x^{4} + 13 x + 3 x^{4} - 8$

Add $4 x^{4}$ and $3 x^{4}$ .

$7 x^{4} + 13 x - 8$