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I have no idea how to do this. I tried using -q(Vb-Va), but that got me 1x10^-6, which is wrong.

The figure below shows three charges at the corners of a rectangle of length x = 0.45 m and height y = 0.29 m. What is the minimum amount of work needed to move the +2.7 µC charge to infinity?

Again, same thing, I tried using that formula, and Vb would be 0 since it is to infinity, but I got -.4779, which is wrong.