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the options are 1)x^2+y^2-6x+6y+8=0 2)x^2+y^2+6x-6y+9=0 3)x^2+y^2+30x-30y+225=0 my question is: the equation of circle which touches the axis at only one point should be valid answer which is the second one becoz 6^2-4.9=0 but answer given is 3rd one,plz explain me where i have gone wrong...

the options are


1)x^2+y^2-6x+6y+8=0


2)x^2+y^2+6x-6y+9=0


3)x^2+y^2+30x-30y+225=0


my question is:


the equation of circle which touches the axis at only one point should be valid answer which is the second one becoz 6^2-4.9=0 but answer given is 3rd one,plz explain me where i have gone wrong...

Grade:11

1 Answers

Askiitians_Expert Yagyadutt
askIITians Faculty 74 Points
9 years ago

Dear Anmol!

 

None of the equation passes through (3,-6) ..so i guess the first condition is wrong ..or equations are wrong ..

 

(3,-6) is not satisying any of the equations...

 

Check out the question again

 

regards

 

Yagya

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