Write in Standard Form (9n^3-4n^2+2n-10)+(-2n^2+n+7)

$(9 n^{3} - 4 n^{2} + 2 n - 10) + (- 2 n^{2} + n + 7)$

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

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

Subtract $2 n^{2}$ from $- 4 n^{2}$ .

$9 n^{3} - 6 n^{2} + 2 n - 10 + n + 7$

Add $2 n$ and $n$ .

$9 n^{3} - 6 n^{2} + 3 n - 10 + 7$

Add $- 10$ and $7$ .

$9 n^{3} - 6 n^{2} + 3 n - 3$