engineering mathematics MCQ #538

The radius of the circle x² + y² + 2x + 4y + 1 = 0 is?

engineering mathematics MCQ #538

  1. Question 1

    Q1. The radius of the circle x² + y² + 2x + 4y + 1 = 0 is?

    • A) 2
    • B) 3
    • C) 4
    • D) 5

    Answer: 2

    Explanation: Rewrite the equation as (x+1)² + (y+2)² = 4 by completing the square. So, radius = √4 = 2.