kenay kenay
  • 11-07-2017
  • Mathematics
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Center - radius form

Center radius form class=

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mreijepatmat
mreijepatmat mreijepatmat
  • 11-07-2017
x² + 6x+ y² + 8y = 11 . Complete the square of (x² + 6x) and (y² + 8y)

a) (x² + 6x) = x²+6x+9- 9 →(x+3)² - 9
b) (y² + 8y) = y²+8y+16-16→(y+4)² - 16

Result: (x+3)² - 9 + (y+4)² - 16 = 11
(x+3)² + (y+4)² - 25 = 11
(x+3)² + (y+4)²  = 36 and the center O(-3,-4)
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