# How do you add 2sqrt5 + 4sqrt5?

The answer is: $6 \sqrt{5}$
$2 \cdot \sqrt{5} + 4 \cdot \sqrt{5}$
Now you can group the expression by the common element ($\sqrt{5}$).
$\sqrt{5} \cdot \left(2 + 4\right) = 6 \sqrt{5}$