Let $a$ and $b$ be positive real numbers.  Find the maximum value of
\[2(a - x)(x + \sqrt{x^2 + b^2})\]in terms of $a$ and $b.$
Question:
Let $a$ and $b$ be positive real numbers.  Find the maximum value of
\[2(a - x)(x + \sqrt{x^2 + b^2})\]in terms of $a$ and $b.$
Answer:
Let's think step by step.

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a^2 + b^2
Let $a$ and $b$ be positive real numbers.  Find the maximum value of
\[2(a - x)(x + \sqrt{x^2 + b^2})\]in terms of $a$ and $b.$
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