Point charges of 5.0C, +3.0C, and +5.0C are located along the x axis at x = 1.0

Point charges of –5.0μC, +3.0μC, and +5.0μC are located along the x axis at x = –1.0 cm, x = 0, and x = +1.0 cm, respectively. Calculate the electric field at x = 3.0 cm and at x = 15.0 cm. Is there some point on the x axis where the magnitude of the electric field is zero? Locate that point.