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If (4,2) and (k,-3) are conjugate points...

If (4,2) and (k,-3) are conjugate points with respect to `x^(2)+y^(2)-5x+8y+6=0` them k=

A

`(28)/(3)`

B

`-(28)/(3)`

C

`(3)/(28)1`

D

`-(3)/(28)`

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