What is the length of GH?

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What is the length of GH?

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Can you help me? I personally believe that this can't be solved?

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HINT: Use the formula for the tangent-chord relationship. The formula is $a^2=b(b+c)$, where $a=\text{tangent length}$, $b=\text{exterior chord length}$, and $c=\text{interior chord length}$. Then solve for $x$.