Help w/ Math Prob please!! (Circles)?

[meg]

"consider the circle that passes through the given pts. below. consider the chords PQ and QR. find the equations for the perpendicular bisectors of these chords, and these 2 equations to find the center of the circle. find the radius of the circle. use your center and radius to find the equation of the circle in graphing form, then multiply it out so that your final answer is in x^2+y^2+ax+by+c=0 form.

P(-1,3), Q(-1,-2), R(0, -4)"

i'm all over the place on this problem...i got an answer but i'm pretty sure it's not right at all...any help would be great..