Hi,

9x^2 + 25y^2 = 225

  C(0,0)  x-axis the major axis

sqrt(25-9) = 4 , foci (-4,0) and (4,0)



4x^2 + 9y^2 = 144

 C(0,0) x-axis the major axis



foci (-, 0) and (, 0)

 

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