Suppose the charge -2q at x = 1.00 m is replaced with a charge -3q, where q

Question:

Suppose the charge -2q at x = 1.00 m is replaced with a charge -3q, where q = 4.11 × 10-9 C. The charge +q is at the origin.
(a) Is the electric potential positive, negative, or zero at the point x = 0.333 m? Explain.
(b) Find the point between x = 0 and x = 1.00 m where the electric potential vanishes.
(c) Is there a point in the region x < 0 where the electric potential passes through zero?