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rumus umum L : x²+y²-2ax-2by+C = 0
meyinggung sb x --> r² = b²
-2b = 6
b = -3 --> r² = 9
C = a²+b² - r²
49 = a²+(-3)²- 9
= a²+9-9
a² = 49
a = 7 atau a = -7