It is given that the equation $\sqrt { x + p } + \sqrt { x } = p$ has at least one real solution for $x$, where $p$ is a real constant.
What is the complete set of possible values for $p$ ?
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It is given that the equation $\sqrt { x + p } + \sqrt { x } = p$ has at least one real solution for $x$, where $p$ is a real constant.

What is the complete set of possible values for $p$ ?