duckhunter6101 duckhunter6101
  • 21-05-2018
  • Mathematics
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1.The equation of a circle in general form is x2 + y2 – 6x + 4y – 86 = 0 What is the center and radius of the circle?


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tramserran
tramserran tramserran
  • 22-05-2018
x² - 6x       + y² + 4y     = 86 

Complete the square:
x² - 6x + (9)  +  y²+4y + (4) = 86 + (9) + (4)
→(x - 3)² + (y + 2)² = 99

Center: (3, -2)
radius: √99 = 3√11
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