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5-61.
  1. Write the equation in graphing form of each circle described below. Homework Help ✎

    1. A circle with radius 12 centered at the point (–2, 13).

    2. A circle with center (–1, –4) and radius 1.

    3. A circle with equation x2 + y2 – 6x + 16y + 57 = 0. (Hint: Complete the square for both x and y.)

(xh)2 + (yk)2 = r2

Refer to the hint in part (a).

Factor the expressions in parentheses and simplify.