Hyperbola 2 Question 13

13. Equation of the circle with AB as its diameter is

(a) x2+y212x+24=0

(b) x2+y2+12x+24=0

(c) x2+y2+24x12=0

(d) x2+y224x12=0

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Answer:

Correct Answer: 13. (2)

Solution:

  1. The equation of the hyperbola is x29y24=1 and that of circle is x2+y28x=0

For their points of intersection, x29+x28x4=1

4x2+9x272x=3613x272x36=013x278x+6x36=013x(x6)+6(x6)=0x=6,x=136

x=136 not acceptable.

Now, for x=6,y=±23

Required equation is, (x6)2+(y+23)(y23)=0

x212x+y2+24=0x2+y212x+24=0



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