The centre and radius of the sphere (ba...

The centre and radius of the sphere `(bar r-3bari-4barj+5bark)*(barr-2bari+3barj-4bark)=0` are

`5bari+barj-bark, sqrt(139)`

`(1)/(2) (5bari+barj-bark), (sqrt(131))/(2)`

`bari+7barj-9bark, sqrt(27)`

`(1)/(2) (bari+7barj-9bark), sqrt(79)`

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