A) \[7x\pm y+50=0\]
B) \[7x\pm y-5=0\]
C) \[y\pm 7x+5=0\]
D) \[y\pm 7x-5=0\]
Correct Answer: A
Solution :
Points where \[x+7=0\] meets the circle \[{{x}^{2}}+{{y}^{2}}=50\] are \[(-7,\ 1)\] and\[(-7,\ -1)\]. Hence equations of tangents at these points are \[-7x\pm y=50\] or\[7x\pm y+50=0\].You need to login to perform this action.
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