OK, I tried doing part of this problem but now I am stuck.

1a. Find the center (h,k) and the radius r of each circle.

$\displaystyle x^2+y^2+4x+2y-20=0$

$\displaystyle x^2+y^2+4x+2y-20=0$

$\displaystyle (x^2+4x)+(y^2+2y)=20$

$\displaystyle (x^2+4x+4)+(y^2+2y+1)=20+4+1$

$\displaystyle (x^2+4x+4)+(y^2+2y+1)=25$

Next Step, what exactly do I do now to solve this?