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a. x² + y² + 16y - 15 = 0
(x-0)² + (y+8)² - 64 -15 = 0
(x-0)² + (y+8)² = 79, maka titik pusat (0,-8) dan r= √79
b. x² + y² + 2x = 0
(x+1)² + (y-0)² - 1 = 0
(x+1)² + (y-0)² = 1, maka titik pusat (-1,0) dan r= √1 = 1
c. x² + y² - 2x + 2y = 0
(x-1)² + (y+1)² -1 - 1 = 0
(x-1)² + (y+1)² = 2, maka titik pusat (1,-1) dan r= √2
d. 3x² + 3y² - 9x - 6y = 0
x² + y² - 3x - 2y = 0
(x-(3/2))² + (y-1)² - (9/4) - 1 = 0
(x-(3/2)² + (y-1)² = 13/4, maka titik pusat ((3/2),1) dan r= √(13/4)
= (1/2).√13