Maths-
General
Easy

Question

The equation of the ellipse with axes along the x – axis and the y – axis, which passes through the points P (4, 3) and Q (6, 2) is

  1. fraction numerator x to the power of 2 end exponent over denominator 50 end fraction plus fraction numerator y to the power of 2 end exponent over denominator 13 end fraction equals 1    
  2. fraction numerator x to the power of 2 end exponent over denominator 52 end fraction plus fraction numerator y to the power of 2 end exponent over denominator 13 end fraction equals 1    
  3. fraction numerator x to the power of 2 end exponent over denominator 13 end fraction plus fraction numerator y to the power of 2 end exponent over denominator 52 end fraction equals 1    
  4. fraction numerator x to the power of 2 end exponent over denominator 52 end fraction plus fraction numerator y to the power of 2 end exponent over denominator 17 end fraction equals 1    

hintHint:

When the centre of the ellipse is at the origin (0,0) and the foci are on the x-axis and y-axis, then we can easily derive the ellipse equation.
The equation of the ellipse is given by;
x squared over a squared plus y squared over b squared space equals space 1

The correct answer is: fraction numerator x to the power of 2 end exponent over denominator 52 end fraction plus fraction numerator y to the power of 2 end exponent over denominator 13 end fraction equals 1


     The equation of the ellipse is given by;
    x squared over a squared plus y squared over b squared space equals space 1 ........ (1)
     Given : It passes through the points P (4, 3) and Q (6, 2) 
    Thus from equation (1)
    16 over a squared plus 9 over b squared space equals space 1  ........... (a)
    36 over a squared plus 4 over b squared space equals space 1 ........... (b)
    Subtracting (b) from (a), we get
    fraction numerator negative 20 over denominator a squared end fraction plus 5 over b squared space equals space 0
5 a squared space equals space 20 b squared
a squared space equals space 4 b squared

    Putting the value of a squared in equation (a)
    fraction numerator 16 over denominator 4 b squared end fraction plus 9 over b squared space equals space 1
b squared space equals space 13
a squared space equals space 4 b squared space equals space 4 space cross times 13 space equals space 52
T h u s comma space e q u a t i o n space o f space e l l i p s e space equals space x squared over 52 plus space y squared over 13 space equals space 1

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