A particle moving in the xy-plane is subject to a force F → (x, y) = (50 N · m^2) [(xi + yj ) / (x^2 + y^2)^3/2,] where x and y are in meters. Calculate the work done on the particle by this force, as it moves in a straight line from the point (3 m, 4 m) to the point (8 m, 6 m).