The expression in the image is:

$\sqrt{8} + 3\sqrt{2}$

Step-by-step simplification:

1. Simplify $\sqrt{8}$: $\sqrt{8} = \sqrt{4 \times 2} = \sqrt{4} \times \sqrt{2} = 2\sqrt{2}$

2. Now substitute $\sqrt{8}$ with $2\sqrt{2}$: $2\sqrt{2} + 3\sqrt{2}$

3. Combine like terms (both terms contain $\sqrt{2}$): $(2 + 3)\sqrt{2} = 5\sqrt{2}$

Thus, the simplified form of the expression is:

$5\sqrt{2}$

Let me know if you'd like more details or further clarification!

Related Questions:

1. How do you simplify other square roots like $\sqrt{18}$?
2. Can you explain how to factor numbers inside square roots?
3. What are like terms in radical expressions, and how do you combine them?
4. How do you simplify $\sqrt{12} + \sqrt{27}$?
5. Can you solve expressions involving cube roots?

Tip:

Always look for perfect square factors within a square root to simplify expressions more easily.