Answer
$\sqrt 24 \ne 4\sqrt 6$
correction: $\sqrt 24 = \sqrt4\times\sqrt 6$
Work Step by Step
The student simplified $\sqrt 24$ as 4$\sqrt 6$, which doesn't work.
Instead of $\sqrt6$+ 4$\sqrt 6$, they should've written $\sqrt6$+ $\sqrt4*$$\sqrt6$.
$\sqrt6+ \sqrt4* \sqrt6 = \sqrt6+ 2\sqrt6 = 3\sqrt6$