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1)

The circle passing through (1,-2) and touching the axis of x at (3,0) also passes through the point 


A) (-5,2)

B) (2,-5)

C) (5,-2)

D) (-2,5)

Answer:

Option C

Explanation:

 Let the equation of circle be 

542021161_m3.JPG

(x3)2+(y0)2+λy=0

 As it passes  through  (1,-2)

    (13)2+(2)2+λ(2)=0

     4+42λ=0λ=4

     (x3)2+y2+4y=0   By hit and trial method, we see  that point(5,-2) satisfies equation of circle.