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Q.

If (3,-4) is the point to which the origin is shifted and the transformed equation is X2 +Y2 = 4 then the original equation is

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a

x2+y26x+8y+21=0

b

x2+y26x8y+21=0

c

x2+y2+6x+8y+21=0

d

x2+y2+6x+8y21=0

answer is C.

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Detailed Solution

X=x3,Y=y+4 transformed equation is X2+Y2=4 Original equation is  (x3)2+(y+4)2=4 x2+y2-6x+8y+21=0

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