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# If *l*x + my + n = 0 is a tangent to the parabola x^{2} = y, then condition of tangency is

*l*^{2} = 2mn
*l* = 4 m^{2 }n^{2}
- m
^{2} =
*l*^{2} = 4mn.

*l*^{2}= 2mn*l*= 4 m^{2 }n^{2}^{2}=*l*^{2}= 4mn.## The correct answer is: *l*^{2} = 4mn.

### To find the condition of tangency.

As we know, x=my+x touch the parabola .

lx+my+n=0

Therefore, the condition of tangency is = 4mn.

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