Answer:
center: (-1 , 5)
radius: 7
Step-by-step explanation:
circle: (x – h)²+ (y – k)² = r², with the center at (h, k) and the radius "r"
x² + y² + 2x - 10y - 23 = (x + 1)² + (y - 5)² - 49 = 0
(x + 1)² + (y - 5)² = 49 = 7²
center: (h , k) (-1 , 5)
radius: 7
