137- In the hyperbola $4x^2 - y^2 + 4y = 12$, $8x^2 - y^2 + 4y = 12$. What is the distance from a focus to an asymptote? (1) $\sqrt{3}$ (2) $2$ (3) $2\sqrt{3}$ (4) $3$
\textbf{137-} In the hyperbola $4x^2 - y^2 + 4y = 12$, $8x^2 - y^2 + 4y = 12$. What is the distance from a focus to an asymptote?
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(1) $\sqrt{3}$ \hfill (2) $2$ \hfill (3) $2\sqrt{3}$ \hfill (4) $3$
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