Find the net force on $q_2.$

$+4.$

vec$(F_1)=$ force exerted on $q_2$ by $q_1$

vec$(F_3)=$ force exerted on $q_2$ by $q_3$

vec$(F_1)=29\mathrm{.}1N,$vec$(F_3)=-14\mathrm{.}7N,vec(F)=,N$

Remember: Forces pointing left are negative $(-)$; forces pointing right are positive $(+).$