The image provided contains a problem in Spanish. The relevant part reads:

"Al resolver el sistema de ecuaciones $\sqrt{x^2 + y^2} + \sqrt{\frac{5}{2}} = 10$, uno de los valores de $x$ es:"

And the answer choices are:

• A) 16
• B) 7
• C) 8
• D) 12
• E) 15

Let's break down and solve the problem:

1. The equation given is: $\sqrt{x^2 + y^2} + \sqrt{\frac{5}{2}} = 10$

2. Isolate the square root involving $x$ and $y$: $\sqrt{x^2 + y^2} = 10 - \sqrt{\frac{5}{2}}$

3. Square both sides to eliminate the square root: $x^2 + y^2 = \left(10 - \sqrt{\frac{5}{2}}\right)^2$

4. Expand the square on the right-hand side: $x^2 + y^2 = 100 - 20\sqrt{\frac{5}{2}} + \frac{5}{2}$ Simplifying the expression: $x^2 + y^2 = \frac{205}{2} - 20\sqrt{\frac{5}{2}}$

5. Since the problem asks for a specific value of $x$, we need to find the value of $x$ that satisfies this equation, considering possible integer solutions.

Considering possible solutions:

To simplify further, it is often useful to test the answer choices directly. However, it is evident from the structure that when we focus on $x^2$, the complexity of the radical might hint that $y = 0$ simplifies the equation significantly. We can then approximate or directly compare the values.

After testing and evaluating, $x = 8$ should be one of the valid solutions. Therefore, the correct answer is C) 8.

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Would you like more detailed steps, or do you have any questions? Here are 5 related questions to further explore the topic:

1. How do you isolate variables in equations with square roots?
2. What techniques are useful in approximating the values of complex radicals?
3. How does squaring both sides of an equation impact the possible solutions?
4. Why might we assume $y = 0$ in this problem to simplify the solution?
5. Can you solve similar problems by testing possible values?

Tip: When dealing with square roots, always consider squaring the entire equation to remove the radical, but remember to check if extraneous solutions are introduced.