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

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

Subtract $2 x^{2}$ from $x^{2}$ .

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

Add $2 x$ and $x$ .

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

Add $- 3$ and $4$ .

$- x^{2} + 3 x + 1$