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

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

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

Subtract $x$ from $x$ .

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

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

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

Add $x$ and $2 x$ .

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

Simplify the expression.

Move $- 3$ .

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

Reorder $3 x$ and $4 x^{2}$ .

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