Suppose the charge +q at the origin is replaced with a charge +5q, where q = 4.11

Question:

Suppose the charge +q at the origin is replaced with a charge +5q, where q = 4.11 × 10-9 C. The charge -2q is still at x = 1.00 m.
(a) Is there a point in the region x > 0 where the electric potential passes through zero?
(b) Find the location between x = 0 and x = 1.00 m where the electric potential passes through zero.
(c) Find the location in the region x > 1.00 m where the electric potential passes through zero?