Question Detail
Question
What is the radius squared of the circle x² + y² + 8x - 10y + 5 = 0?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Complete the square: (x² + 8x) + (y² - 10y) = -5. (x + 4)² - 16 + (y - 5)² - 25 = -5. (x + 4)² + (y - 5)² = 36. So radius squared = 36.
Hint
The notes indicate answer B.