Answer: 3√11.
Explanation:
To simplify the radical expression √99, we can look for perfect square factors of 99.
The prime factorization of 99 is 3 * 3 * 11.
We can rewrite √99 as √(3 * 3 * 11).
Taking out the perfect square factors, we get:
√(3 * 3 * 11) = 3√11.
Therefore, the simplified radical expression for √99 is 3√11.