identify the center and the radius of the given circle

The general equation for a circle is as follows
[tex](x-h)^2+(y-k)^2=r^2[/tex]where (h,k) represents the coordinates of the center of the circle and r is its radius.
Knowing this, we simply identify each part from the given circle:
[tex]h=-2[/tex][tex]y=4[/tex][tex]r=\sqrt[]{43}[/tex]With all this, we can say the circle's center is at the point (-2,4) and it has a radius of lenght √43.
Thus, option B is correct.