kidrauhll3194 kidrauhll3194
  • 03-07-2017
  • Mathematics
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Find the center and radius for the circle, given the equation: x^2-14x+y^2+8=16

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Аноним Аноним
  • 03-07-2017
you can do this by completing the square

x^2 - 14x + y^2 + 8  = 16

(x - 7)^2 - 49 + (y + 4)^2 - 16  = 16

(x - 7)^2 + (y + 4)^2 =   16 + 16 + 49  =  81


so the center is at (7 , -4) and radius = sqrt81 = 9
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