Find all solutions to
\[\sqrt{x^2 + \sqrt{x^2 + 11}} + \sqrt{x^2 - \sqrt{x^2 + 11}} = 4.\]Enter all the solutions, separated by commas.
Question:
Find all solutions to
\[\sqrt{x^2 + \sqrt{x^2 + 11}} + \sqrt{x^2 - \sqrt{x^2 + 11}} = 4.\]Enter all the solutions, separated by commas.
Answer:
Let's think step by step.

user
\sqrt{5}, -\sqrt{5}
Find all solutions to
\[\sqrt{x^2 + \sqrt{x^2 + 11}} + \sqrt{x^2 - \sqrt{x^2 + 11}} = 4.\]Enter all the solutions, separated by commas.
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