$\displaystyle {x}^{{2}}+{y}^{{2}}-{8}{x}+{12}{y}+{51}={0}$ is the equation of a circle with center $\displaystyle {\left({h},{k}\right)}$ and radius $\displaystyle {r}$. Find the equation of the circle in standard form

Equation$\displaystyle =$Preview Question 6 Part 1 of 3  

Center $\displaystyle =$

$\displaystyle {r}=$