Simplify (3-8n-n^2)+(7+2n^2-5n)

$(3 - 8 n - n^{2}) + (7 + 2 n^{2} - 5 n)$

Simplify the expression.

Remove parentheses.

$3 - 8 n - n^{2} + 7 + 2 n^{2} - 5 n$

Add $3$ and $7$ .

$- 8 n - n^{2} + 10 + 2 n^{2} - 5 n$

$- 8 n - n^{2} + 10 + 2 n^{2} - 5 n$

Subtract $5 n$ from $- 8 n$ .

$- n^{2} + 10 + 2 n^{2} - 13 n$

Add $- n^{2}$ and $2 n^{2}$ .

$n^{2} + 10 - 13 n$

Move $10$ .

$n^{2} - 13 n + 10$

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