# How do you simplify -3sqrt7+4sqrt7?

$- 3 \sqrt{7} + 4 \sqrt{7} = \textcolor{g r e e n}{\sqrt{7}}$
$- 3 \text{ squid" + 4 " squid"= +1 " squid}$
In this example we have simply replaced $\text{squid}$ with $\sqrt{7}$
so $- 3 \sqrt{7} + 4 \sqrt{7} = + 1 \sqrt{7}$ (or just: $\sqrt{7}$)