Simplifying square roots
To simplify roots you can use Product Property of Square Roots:
$$√{a×b}=√a×√b$$
At first, find the perfect square inside the square root:
$$√24;→;24=2×2×3×2=4×6$$
$$√24=√{4×6}=√4×√6=2×√6$$
This can be written as $2√6$.