Calculating electric potential charges on point particles

Two point particles, each with charge Q, are placed at positions +- a x.

A) What is the elctric potential anywhere along the y axis?

B) How much energy does it take to move a thrid particle, charge Q, from infinity to a position in order to make an equilateral triangle among the charges? (ie. all edges have length 2a)

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...harge at -a will be k*Q/Sqrt(y*y+a*a). Therefore the potential at position y will be

B)The simplest way to find the energy needed is to ...