How to demonstrate that this may belong to integers

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$\sqrt{(3x ^ 4-12x ^ 2)/16}$ How can I demonstrate that this can belong to integers?

Can you show me? Please! (Without testing values)

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Hint:

Besides the trivial solution when $x=0$,

integers $x=\alpha^n+\alpha^{-n}$, where $\alpha=2+\sqrt3$ and $n$ is an integer, are solutions.