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x² - 4x + y² + 6y = 12
x² - 4x + 4 + y² + 6y + 9 = 12 + 4 + 9
(x - 2)² + (y + 3)² = 25
persamaan garis singgung lingkaran di titik (6,-6)
(x₁ - a) (x - a) + (y₁ - b) (y - b) = r²
(x₁ - 2) (x - 2) + (y₁ + 3) (y + 3) = 25
(6 - 2) (x - 2) + (-6 + 3) (y + 3) = 25
4 (x - 2) - 3 (y + 3) = 25
4x - 8 - 3y - 9 - 25 = 0
4x - 3y - 42 = 0
semoga membantu ya :)