Simplify 6n^2-2n-3+5n^2-9n-6

$6 n^{2} - 2 n - 3 + 5 n^{2} - 9 n - 6$

Add $6 n^{2}$ and $5 n^{2}$ .

$11 n^{2} - 2 n - 3 - 9 n - 6$

Subtract $9 n$ from $- 2 n$ .

$11 n^{2} - 11 n - 3 - 6$

Subtract $6$ from $- 3$ .

$11 n^{2} - 11 n - 9$