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Co - ordinate Geometry Circles

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The equations of the tangents to the circle x²+y²=50 at the points where the line x+7=0 meets it, are

A. 7x ± y + 50 = 0

B. 7x ± y - 5 = 0

C. y ± 7x + 5 = 0

D. y ± 7x - 5 = 0

E. None of the above

View Answer

Correct choice: A

Explanation:

Points where x+7 = 0 meets the circle x²+y² = 50 are (-7,1) and (-7,-1). Hence equations of tangents at these points are -7x ± y = 50 or 7x ± y+50 =0.

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Eamcet Mathematics Co - ordinate Geometry Circles

Eamcet Mathematics
Co - ordinate Geometry Circles