engineering mathematics MCQ #458

The equation x² + y² + 4x - 6y + 9 = 0 represents a circle with radius:

engineering mathematics MCQ #458

  1. Question 1

    Q1. The equation x² + y² + 4x - 6y + 9 = 0 represents a circle with radius:

    • A) 2
    • B) √2
    • C) 3
    • D) 4

    Answer: √2

    Explanation: Complete the square: radius r = √[(2)² + (3)² - 9] = √2.