Question Detail
Question
In the general equation of a circle x² + y² + 2gx + 2fy + c = 0, what are the coordinates of the centre?
Correct Answer
Option B is the correct answer.
Detailed Explanation
By comparing the expanded standard form (x - a)² + (y - b)² = r² with the general form, we find that the centre (a, b) is equal to (-g, -f).
Hint
This is derived from completing the square on the general form.