1.

If (x_(1),y_(1)) and (x_(2),y_(2)) are ends of focal chord of y^(2)=4ax then x_(1)x_(2)+y_(1)y_(2) =

Answer»

`a^(2)`
`-3 a^(2)`
`5A^(2)`
`-5a^(2)`

ANSWER :B


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