NotSoGoodAtMath7056 NotSoGoodAtMath7056
  • 04-09-2017
  • Mathematics
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Find the center and radius of the circle described by x2 + y2 − 6x + 12y − 19 = 0

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ghanami
ghanami ghanami
  • 04-09-2017
hello : 
x2 + y2 − 6x + 12y − 19 = 0
(x²-6x)+ (y²+12y) -19 = 0
(x²-6x+9)-9 + (y²+12y+36)-36 -19 = 0
(x-3)² + (y+6)² = 8²
the center is : (3 , -6) and radius : 8
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