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Q.

If P3,2 is one end of focal chord PQ of the parabola y2+4x+4y=0 ,then the slope of normal at Q is

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a

-1/2

b

2

c

1/2

d

-2

answer is A.

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Detailed Solution

y2+4x+4y=0 differentiating wrt x 2y dydx+4+4 dydx=0 dydx=-42y+4=-2y+2

Slope of normal at Q= slope of tangent at P =dydx3,2=12

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If P−3,2 is one end of focal chord PQ of the parabola y2+4x+4y=0 ,then the slope of normal at Q is