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pallavi pradeep bhardwaj Grade: 12
        

If x + y = k is normal to y2 = 12 x, then k is :
(A) 3                                        (B) 9
(C) –9                                      (D) –3

7 years ago

Answers : (1)

Ramesh V
70 Points
										

slope of parabola at any point is :


dy/dx = 12/2y


slope of line is -1,


as line is normal, (-1)*(12/2y) = -1


y = 6 and so x is 3


so eqn of line is x+y=9


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Regards,
Ramesh
IIT Kgp - 05 batch

7 years ago
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