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Point charges of -8mueC, -4 mueC and +8 mueC are located at the x-axis at x=-1cm...

Point charges of -8mueC, -4 mueC and +8 mueC are located at the x-axis at x=-1cm X=0 and X=+1 cm respectively.
1)Calculate the electric field at x=3cm
2) Calculate the electric field at x=15cm
3)Locate a point on the positive x axis where the magnitude of the electric field is zero

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