Verified answer

x² - 6x + y² + 4y + p = 0

x² - 6x + 9 - 9 + y² + 4y + 4 - 4 + p = 0

(x - 3)² + (y + 2)² = -p + 9 + 4 = 13 - p

13 - p > 0

p < 13 --> p = 12

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