At three corners of a rectangle length 4d height d the

Question

At three corners of a rectangle (length = 4d, height = d), the following charges are located: +q₁ (upper left corner), +q₂ (lower right corner), and q (lower left corner). The net electric field at the (empty) upper right corner is zero. Evaluate the magnitudes of q₁ and q₂ charges. Express your answers in terms of q.