Greetings from Brasil...
The expression that allows using the equation of a circle is:
(X - Xc)² + (Y - Yc)² = R²
as
Xc = - 4, Yc = 4 and R = 4, then
or
X² + 8X + Y² - 8Y + 16 = 0
1.6m questions
2.0m answers