I'm having trouble believign that. You musn't be looking in the right place.
A focus of x^2/169 + y^2/25 = 1
Do you recognize an ellipse?
Major Axis length 13*2 = 26 - parallel to the x-axis ==> a = 13
Minor Axis length 5*2 = 10 - parallel to the y-axis ==> b = 5
These are things you should simply pull out of yoru hat when encountering such an expression.
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