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M = (-A/2) , (-B/2)
= (-8/2) , (-(-4/2))
= (-8/2) , (4/2)
= - 4 , 2
2x² + 2y² + 8x - 4y -22 =0
bagi 2
x² + 4x + y² - 2y -11 =0
(x +2)² + (y- 1)² = 11+4+1 = 16
P(-2, 1) dan r = 4