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Verified answer
Persamaan Lingkaranx² + y² + 4x - 2y + 3 = 0
(x + 2)² + (y - 1)² = -3 + 2² + (-1)²
Pusat = (a,b) = (-2,1)
a² - 2b = (-2)² - 2.1 = 2 ✔