Coulomb's law right triangle parallelogram method

There is a right triangle and three electrical charges are located at its vertices, two positive and one negative. Find the magnitude of the net resultant force on the negative charge as a result of the other two.

[@PanConCola]

y si quiero saber la de q1 como se haria ?

[@smashmystery8135]

Por qué si lo hago en la calculadora no me sale 7.82N

Saludos debes usas paréntesis asi: √((F1)^2+(F2)^2-2.F1.F2.cosθ)