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Which of the following line can be norma...

Which of the following line can be normal to parabola `y^2=12 x ?` `x+y-9=0` (b) `2x-y-32=0` `2x+y-36=0` (d) `3x-y-72=0`

A

x+y-9=0

B

2x-y-32=0

C

2x+y-36=0

D

3x-y-99=0

Text Solution

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The correct Answer is:
A, C, D
1,3,4 The equation of normal to the parabola `y^(2)=12x` having slope m is `y=mx-6m-3m^(3)`. Options (1), (3) and (4) are normal for m=-1,-2, and 3, respectively.
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