Which equation represents the general form a circle with a center at (–2, –3) and a diameter of 8 units?

A circle with diameter 8 has radius 4. Using center (–2, –3), its equation is (x + 2)² + (y + 3)² = 4². Expanding and moving everything to one side gives x² + y² + 4x + 6y – 3 = 0, which is choice C.

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