There is a hyperbola in blue with double arrows intersects with y-axis at -4 and 4. Its asymptote in dashed orange is $y=(4/5)x$ and $y=-(4/5)x$. There is also a green rectangular tangent to the hyperbola. Find the equation of the hyperbola.

Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: There is a hyperbola in blue with double arrows intersects with y-axis at -4 and 4. Its asymptote in dashed orange is $y=(4/5)x$ and $y=-(4/5)x$. There is also a green rectangular tangent to the hyperbola. Find the equation of the hyperbola.

Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: There is a hyperbola in blue with double arrows intersects with y-axis at -4 and 4. Its asymptote in dashed orange is $y=(4/5)x$ and $y=-(4/5)x$. There is also a green rectangular tangent to the hyperbola. Find the equation of the hyperbola.
