Tangents drawn from the point (α,3) to the circle 2x2+2y2=25 will be perpendicular to each other if αequals

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-4

-5

answer is B.

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Detailed Solution

The equation of director circle is x2+y2=25. The point (α,3) must lie on this circle. So,α2+9=25 or α2=16 or α=±4

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