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8-59.
  1. Find the center and radius of each circle below. Homework Help ✎

    1. (y − 7)2 = 25 − (x − 3)2

    2. x2 + y2 + 10y = −9

    3. x2 + y2 + 18x − 8y + 47 = 0

    4. y2 + (x − 3)2 = 1

Add (x − 3)² to both sides of the equation.

Center: (3, 7)Radius: 5

See parts (a) and (b).

Complete the square.

Center: (0, −5) Radius: 4

See parts (a) and (b).