x² + y² - 2x - 4y - 5 = 0
A = -2
B = -4
C = -5
di titik A(5, 12)
x₁ = 5
y₁ = 12
x₁.x + y₁.y + A(1/2(x₁ + x)) + B(1/2(y₁ + y)) + C = 0
5x + 12y + (-2)(1/2(5 + x)) + (-4)(1/2(12 + y) + (-5) = 0
5x + 12y - 5 - x - 24 - 2y - 5 = 0
4x + 10y - 34 = 0
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x² + y² - 2x - 4y - 5 = 0
A = -2
B = -4
C = -5
di titik A(5, 12)
x₁ = 5
y₁ = 12
x₁.x + y₁.y + A(1/2(x₁ + x)) + B(1/2(y₁ + y)) + C = 0
5x + 12y + (-2)(1/2(5 + x)) + (-4)(1/2(12 + y) + (-5) = 0
5x + 12y - 5 - x - 24 - 2y - 5 = 0
4x + 10y - 34 = 0