Answer
$6\sqrt3$
Work Step by Step
Since these are like terms, they can be added. Think of radicals as variable terms - it's a helpful trick when deciding what you can add and what you cannot. For example:
$2\sqrt3$ $+$ $4\sqrt3$ can be compared to:
$2x+4x$... you know these can be added:
$6x$
Therefore:
$2\sqrt3$ $+$ $4\sqrt3$ $=6\sqrt3$
