Question 818982
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Hi,
 Standard Form of an Equation of an Ellipse is {{{(x-h)^2/a^2 + (y-k)^2/b^2 = 1 }}} 
where Pt(h,k) is the center. (a variable positioned to correspond with major axis)
 a and b  are the respective vertices distances from center
25x^2+15y^2-375 = 0 
25x^2+15y^2= 375    |Dividing each term by 375
{{{x^2/15  + y^2/25 = 1}}}