For how many real values of x is sqrt(63 - 3*sqrt(x)) an integer?
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\(f(x)=\sqrt{63 - 3\cdot \sqrt{x}}\in \mathbb Z\)
\(x\in \{81,324\} \)
\(f(x)\in \{\ 6\ ,\ 3\ \}\)
For two real values of x is sqrt(63 - 3*sqrt(x)) an integer.
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