Question

How do you combine like terms in `(- 7m ^ { 2} - 8n - 8) + ( - n ^ { 2} + 9n + 9)`?

Answer 1

`-7m^2-n^2+n+1`

Explanation:

Removing braces,
`-7m^2-8n-8-n^2+9n+9=-7m^2-8n+9n-8+9-n^2`
`-7m^2+n+1-n^2`