We can simplify $4\sqrt{18}$ step by step:

1. Start by simplifying the square root of 18: $\sqrt{18} = \sqrt{9 \times 2} = \sqrt{9} \times \sqrt{2} = 3\sqrt{2}$

2. Now, multiply by 4: $4\sqrt{18} = 4 \times 3\sqrt{2} = 12\sqrt{2}$

So, the simplified expression is $12\sqrt{2}$.

Would you like more details or have any questions?

Here are 5 related questions:

1. How would you simplify $5\sqrt{50}$?
2. What is the simplified form of $3\sqrt{32}$?
3. Can you simplify $6\sqrt{72}$?
4. How do you simplify $7\sqrt{20}$?
5. What is the process to simplify $2\sqrt{45}$?

Tip: When simplifying square roots, look for perfect square factors (like 4, 9, 16, etc.) to factor out.