A) \[4x-8y=11\]
B) \[4x+8y=21\]
C) \[8x+4y=21\]
D) \[4x-8y=21\]
Correct Answer: B
Solution :
\[S:{{x}^{2}}+{{y}^{2}}\,+2gx\,+2fy+c=0\] \[h=-g;\,k=-f\] \[(2,4)\Rightarrow \,4+16+4g+8f+c=0\] \[4g+8f+20+c=0\] ?(1) \[f2g(0)+2f(0)=c-1\] \[\therefore \,\,c=1\] ?(2) (1) & (2) gives \[4g+8f+21=0\] \[\Rightarrow \,-4h-8k+21=0\] \[\Rightarrow \,4h+8k=21\]You need to login to perform this action.
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