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A point stays 3 units from (2, -1). Its locus has equation
Ax² + y² + 4x - 2y - 4 = 0
Bx² + y² - 4x - 2y - 4 = 0
Cx² + y² - 4x + 2y - 4 = 0
Dx² + y² - 4x + 2y + 4 = 0
Answer & Solution
Correct answer: C. x² + y² - 4x + 2y - 4 = 0
(x - 2)² + (y + 1)² = 9 expands to x² + y² - 4x + 2y - 4 = 0.
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