Brendeni, this is the solution:
C = (-2, 3)
r = 5
Let's recall that the standard form of the equation of a circle is:
(x - h)² + (y - k)² = r²
Therefore, we have:
h = -2
k = 3
r = 5
Replacing in the formula,
(x - (-2))² + (y - 3)² = 5²
(x + 2 )² + (y - 3)² = 25