#" first; calculate distance between (-7,1) and (3,5)"# #r^2=(3+7)^2+(5-1)^2)# #r^2=100+16# #r^²=116# #"Force between two charge is given formula by:"# #F_(q_1q_2)=(k*q_1*q_2)/r^2# #F_(q_1q_2)=(9*10^9*(-2)*(-3))/116# #F_(q_1q_2)=(54*10^9)/116# #F_(q_1q_2)~=0,46551*10^9 " N"#