Write in Standard Form (-10x^2+x)+(-2x^2+9x+7)

$(- 10 x^{2} + x) + (- 2 x^{2} + 9 x + 7)$

To write a polynomial in standard form, simplify and then arrange the terms in descending order.

$a x^{2} + b x + c$

Subtract $2 x^{2}$ from $- 10 x^{2}$ .

$- 12 x^{2} + x + 9 x + 7$

Add $x$ and $9 x$ .

$- 12 x^{2} + 10 x + 7$