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Foci of an ellipse from equation

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Problem

The equation of an ellipse is given below.
start fraction, left parenthesis, x, minus, 3, right parenthesis, squared, divided by, 25, end fraction, plus, start fraction, left parenthesis, y, plus, 1, right parenthesis, squared, divided by, 169, end fraction, equals, 1
What are the foci of this ellipse?
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