Question

encontre a equação reduzida de circunferência de centro c(-2,-4) e raio r=4.

Answer 1

$C(-2;-4)\ e\ r=4\\\\\\(x-x_{'})^2+(y-y_{'})^2=r^2 \\\\\\ (x-(-2))^2+(y-(-4))^2=4^2\to \\\\ (x+2)^2+(y+4)^2=16$