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JEE Main 2012 Mathematics question

MathematicsApplication of DerivativesJEE Main 2012

The chord PQ of the parabola , where one end P of the chord is at point (4, −2), is perpendicular to the axis of the parabola. Then the slope of the normal at Q is

Answer: (1)

Solution

A chord perpendicular to the axis (x-axis) is vertical, so Q = (4, 2). At Q,

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Question ID VK-103695