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An arc PQ of a circle subtends a right angle at its centre O. The mid point of the arc PQ is R. If OP = u , OR = v and OQ = u  + v  , then  2 are the roots of the equation

1. x 2 + x – 2 = 0
2. x 2 – x – 2 = 0
3. 3x 2 – 2x – 1 = 0
4. 3x 2 +2 x – 1 = 0

Correct answer: x 2 – x – 2 = 0

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