Value of $\log_6(\sqrt{2-\sqrt{3}} + \sqrt{2+\sqrt{3}})$ is:
Step-by-Step Solution
Key Concept: Logarithm properties and nested radicals
Step 1: Define the expression inside the logarithm.
Let $S = \sqrt{2-\sqrt{3}} + \sqrt{2+\sqrt{3}}$. We need to find the value of $\log_6(S)$.
Step 2: Square both sides to simplify the expression.
We calculate $S^2$ by expanding:
$$S^2 = \left(\sqrt{2-\sqrt{3}} + \sqrt{2+\sqrt{3}}\right)^2$$
Using the formula $(a+b)^2 = a^2 + 2ab + b^2$:
$$S^2 = (2-\sqrt{3}) + 2\sqrt{(2-\sqrt{3})(2+\sqrt{3})} + (2+\sqrt{3})$$
Step 3: Simplify the product under the square root.
Using the difference of squares formula $(a-b)(a+b) = a^2 - b^2$:
$$(2-\sqrt{3})(2+\sqrt{3}) = 4 - 3 = 1$$
Therefore:
$$S^2 = (2-\sqrt{3}) + 2\sqrt{1} + (2+\sqrt{3})$$
Step 4: Combine like terms.
$$S^2 = 2 - \sqrt{3} + 2 + \sqrt{3} + 2(1)$$
$$S^2 = 4 + 2 = 6$$
Step 5: Find the value of $S$.
Since $S > 0$ (as it is a sum of positive square roots):
$$S = \sqrt{6}$$
Step 6: Evaluate the logarithm.
$$\log_6(S) = \log_6(\sqrt{6}) = \log_6(6^{1/2}) = \frac{1}{2}$$
Step 7: Identify the nature of the answer.
The value $\frac{1}{2}$ is rational (it can be expressed as a ratio of integers) but not an integer.
**Final Answer:** The value of $\log_6(\sqrt{2-\sqrt{3}} + \sqrt{2+\sqrt{3}}) = \frac{1}{2}$, which is **rational but not integer**.
This corresponds to **Option 2**.
Correct Answer: 4