A circle \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0\] passing through \[(4,\ -2)\] is concentric to the circle \[{{x}^{2}}+{{y}^{2}}-2x+4y+20=0\], then the value of c will be [RPET 1984, 86]

A circle \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0\] passing through \[(4,\ -2

1.	A circle \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0\] passing through \[(4,\ -2)\] is concentric to the circle \[{{x}^{2}}+{{y}^{2}}-2x+4y+20=0\], then the value of c will be [RPET 1984, 86]
A.	? 4
B.	4
C.	0
D.	1
Answer» B. 4

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A circle \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0\] passing through \[(4,\ -2)\] is concentric to the circle \[{{x}^{2}}+{{y}^{2}}-2x+4y+20=0\], then the value of c will be [RPET 1984, 86]

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