Simplify (x^2-3x+4)+(x^3+3x-4)

$(x^{2} - 3 x + 4) + (x^{3} + 3 x - 4)$

Remove parentheses.

$x^{2} - 3 x + 4 + x^{3} + 3 x - 4$

Combine the opposite terms in $x^{2} - 3 x + 4 + x^{3} + 3 x - 4$ .

Add $- 3 x$ and $3 x$ .

$x^{2} + 4 + x^{3} + 0 - 4$

Add $x^{2} + 4 + x^{3}$ and $0$ .

$x^{2} + 4 + x^{3} - 4$

Subtract $4$ from $4$ .

$x^{2} + x^{3} + 0$

Add $x^{2} + x^{3}$ and $0$ .

$x^{2} + x^{3}$