The focal axis is horizontal, so the equation is in the form

The center (h, k) is in between the two vertices, so it's (0, 5).

ais the distance from the center to one of the vertices, so a = 5.

cis the distance from the center to one of the foci, so c = 7.

The relationship between a, b, c is

so solve for b:

So the equation should be

Nothing to it!

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