Current Attempt in Progress

A $14$ N force with a fixed orientation does work on a particle as the particle moves through displacement vec$(d)=(4$hat$(i)-5$hat$(j)+4$widehat$(k))m.$ What is the angle between the force and the displacement if the change in the particle's kinetic energy is $($a$)+31\mathrm{.}7$ J and $(b)-31\mathrm{.}7J?$