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Q.

The mid point of the chord x – 2y + 7 = 0 w.r.t the circle x2+y22x10y+1=0 is

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a

75,215

b

74,214

c

-75,-215

d

(7,21)

answer is C.

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Detailed Solution

Equation of circle x2+y2-2x-10y+1=0

 So; center=(1,5)

 Equation of chord x−2y+7=0

P= mid-point of chord =(h,k)

Now, P must satisfy the equation of chord x−2y+7=0

h−2k+7=0    -  (1)

Now; slope of AB  X slope of PC=−1

 slope of AB=12(given equation)

  k-5h-1(12)=-1

2h+k-7=0(2) By solving (1) and (2) we get h=75,k=215

 

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