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(x - a)² + (y - b)² = r²
titik pusat (a,b)
jari-jari = r
4x² + 4y² + 4x - 12y + 1 = 0
4x² + 4x + 4y² - 12y = -1
4(x² + x + 1) + 4(y² - 3y + 9/4) = -1 + 4 + 9
4(x + 1)² + 4(y - 3/2)² = 12 ----> kedua ruas dibagi 4
(x + 1)² + (y - 3/2)² = 3
titik pusat (-1,3/2)
jari-jari = √3
semoga membantu ya :)