Question 437874
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Hi
Re: reply  4X^2+4Y^2=16 
 x^2 + y^2 = 4    | II.  circle: C(0,0) radius 2 
x^2/16+ y^2/4=1  Ellipse
Need to be familiar with various standard forms:
I.The standard form of a Parbola is {{{(x -h)^2 = 4p(y -k)}}} 
II.Standard Form of an Equation of a Circle is {{{(x-h)^2 + (y-k)^2 = r^2}}}
III. Standard Form of an Equation of an Ellipse is {{{(x-h)^2/a^2 + (y-k)^2/b^2 = 1 }}}
IV.Standard Form of an Equation of an Hyperbola is 
 {{{(x-h)^2/a^2 - (y-k)^2/b^2 = 1}}} OR   {{{(y-k)^2/b^2 - (x-h)^2/a^2 = 1}}}