What are the center and radius of the circle ?

Answer and explanation

Correct answer: C. center (3, -1), radius 5

  1. Step 1: Complete the square in x and in y.
  2. Step 2: (x - 3)^2 + (y - -1)^2 = 25, so the center is (3, -1) and the radius is 5.
Answer
center (3, -1), radius 5.
Why not the others: The center has the opposite signs of the linear coefficients halved, and the right-hand side is the radius squared.

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