Question: Which of the following equations has no real solutions?

Options:

1. x^2 + 1 = 0
2. x^2 - 1 = 0
3. x^2 + 4 = 0
4. x^2 - 4 = 0

Correct Answer: x^2 + 1 = 0

Solution:

x^2 + 1 = 0 leads to x^2 = -1, which has no real solutions.