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Please Help in this. . I am getting its answer :- D but my coaching gave the answer :- b can u please confirm?

Please Help in this. .
I am getting its answer :- D
but my coaching gave the answer :- b
can u please confirm?

Question Image
Grade:12

2 Answers

Arun
25763 Points
3 years ago
Dear student
 
As we know
In circle,
Coefficient of x² = coefficient of y²
&
Coefficient of xy = 0
Hence
 
\lambda = \mu
\lambda\mu = 4
 
Hence
\mu = \lambda = 2
Now
Radius = sqrt(g² +f² -c)
 = sqrt( 1/4 + 1/4 +10)
 = sqrt(21/2)
Arun
25763 Points
3 years ago
Dear student
As we know
In circle,
Coefficient of x² = coefficient of y²
&
Coefficient of xy = 0
Hence
\lambda = \mu
\lambda\mu = 4
 
Hence
\mu = \lambda = 2
 
Now
Radius = sqrt(g² +f² -c)
 = sqrt( 1/4 + 1/4 +10)
 = sqrt(21/2)
 = 1/2 sqrt(42)
Hence option B is correct.

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