If you could help me figure this integral out I would be very grateful.

top limit: 6

bottom limit: 4

of dx / (x-3)sqrt(x^2-6x+8)

The question involves the arc graphs and whatnot. I'm just really confused.

Sorry if this is a little messy, I'm not experienced with latex. any help would be appreciated, thanks.

Im not even sure where to begin. I know i must make a u substitution but I dont know what with.