Question

How do you simplify `9m (m + n + 1) - 8 (m^2 + m - n)`?

Answer 1

I found: `m^2+m+8n+9mn`

Explanation:

You can multiply and get rid of the brackets:
`=9m^2+9mn+9m-8m^2-8m+8n=`
add together similar terms:
`=m^2+m+8n+9mn`