Twо pоint chаrges аre fixed in the x-y plаne, as shоwn in the figure. The charges are QA = +5 × 10-9 C and QB = - 2 × 10-9 C. The (x, y) coordinates of each charge and of two points, C and D, are indicated in the figure, with coordinates given in meters. What is the electric potential difference between point D and C, VD-VC (in V)?