1.

A variable line L si drawn through O(0,0) to meet lines L_1 and L_2 " given by " y-x-10=0 and y-x-20=0 at point A and B, respectively. Locus of P if(1//OP^2)=(1//OA^2), is

Answer»

`(y-x)^2=80`
`(y-x)^2=100`
`(y-x)^2=64`
NONE of these

Answer :B


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