find the centre and radius of the circle 4 x square + 4 y square - 24 x minus 8 Y - 24 is equal to zero
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4x2+4y2-24x-8y-24
all divided by 4
x2+y2-6x-2y-6
x2+y2=6x+2y+6
compare to ax+bx+c
a=6
b=2
c=6
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