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Let the normal at the point P on the parabola y 2 = 6x pass through the point (5, –8). If the tangent at P to the parabola intersects its directrix at the point Q, then the ordinate of the point Q is :

1. –3
2. 4 9 −
3. 2 5 −
4. –2

Correct answer: 4 9 −

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