The expression in the image is $4 \sqrt{24}$.

To simplify this:

1. Break down the square root into its factors: $\sqrt{24} = \sqrt{4 \cdot 6} = \sqrt{4} \cdot \sqrt{6} = 2\sqrt{6}.$

2. Multiply this by 4: $4 \sqrt{24} = 4 \cdot 2\sqrt{6} = 8\sqrt{6}.$

So, the simplified form of $4 \sqrt{24}$ is: $8\sqrt{6}.$

Would you like further explanations or examples involving similar square root problems?

Here are 5 related questions for practice:

1. Simplify $5\sqrt{50}$.
2. Simplify $3\sqrt{72}$.
3. Simplify $2\sqrt{18}$.
4. Simplify $6\sqrt{48}$.
5. Solve $4\sqrt{36} + 2\sqrt{9}$.

Tip: When simplifying square roots, always look for the largest perfect square factor!