Find the equation of the hyperbola, the length of whose focal chord, perpendicular to the transverse axis, is 8 units and the co-ordinates of the foci are `(0, pm 3sqrt(5))` .

Explanation

To find the equation of the hyperbola, we will follow these steps:

### Step 1: Identify the given information
We know that:
- The length of the focal chord perpendicular to the transverse axis is 8 units.
- The coordinates of the foci are (0, ±3√5).

### Step 2: Determine the orientation of the hyperbola
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