# How do you subtract (-5m^2-m)-(3m^2+4m-5)?

$- 5 {m}^{2} - m - 3 {m}^{2} - 4 m + 5$
Now, you can only add or substract terms that have ${m}^{2}$ with terms that have ${m}^{2}$; likewise, terms that have $m$ can only be added to or substarcted from terms that have $m$. So, we would get
$- 5 {m}^{2} - 3 {m}^{2} - m - 4 m + 5 = - 8 {m}^{2} - 5 m + 5$