# What is the standard form of the equation of a circle with (-1,7) and radius 2?

${\left(x + 1\right)}^{2} + {\left(y - 7\right)}^{2} = 4$
A circle with center $\left(a , b\right)$ and radius $r$
$\textcolor{w h i t e}{\text{XXX}} {\left(x - a\right)}^{2} + {\left(y - b\right)}^{2} = {r}^{2}$