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pusat (a,b) dan jari-jari = r
-2x²-2y²+12x+32y-16 = 0 --> kedua ruas dibagi -2
x²+y²-6x-16y+8 = 0
x²-6x+9+y²-16y+64 = -8+9+64
(x-3)²+(y-8)² = 65
pusat (3,8), jari-jari = √65
semoga membantu ya :)