can any one answer this,,,,really annoying me??? Im told to find the centre foci and hyperbola of $\displaystyle 4x^2-8x-y^2+6y-1=0$

I get everything except the asymptotes,, I think it involves limits or something because I dont get the conventional ax/b or was it bx/a because its switched around? Any way the foci was(1,3$\displaystyle \pm\sqrt{5})$ and centre (1,3) thanks!