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

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Answer 1 · 2015-08-11T21:26:51

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

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

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