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The equation of the parabola using the vertex will be y = a (x+10) (x-10)

Substitute the vertex gives: 16 = a (0+10) (0-10) = -100a; a = -4/25;

The equation of the parabola is y = -4/25 (x

x

The equation can be written as (x – 0)

Therefore (x – 0)

Hence given is equation of a circle with center (0, 2) and radius 4 units.