$\begin{array} { l }h=-1,& k=-4,& r=4\end{array}$
${\left( x-h \right)}^{2}+{\left( y-k \right)}^{2}={r}^{2}$
${\left( x-\left( -1 \right) \right)}^{2}+{\left( y-\left( -4 \right) \right)}^{2}={4}^{2}$
${\left( x+1 \right)}^{2}+{\left( y-\left( -4 \right) \right)}^{2}={4}^{2}$
${\left( x+1 \right)}^{2}+{\left( y+4 \right)}^{2}={4}^{2}$
${\left( x+1 \right)}^{2}+{\left( y+4 \right)}^{2}=16$