Walker, Halliday & Resnick — Electric Potential: Problem 17

17 What is the magnitude of the electric field at the point \((-1.00\hat{i} - 2.00\hat{j} + 4.00\hat{k}) \text{ m}\) if the electric potential in the region is given by \(V = 2.00xyz^2\), where \(V\) is in volts and coordinates \(x\), \(y\), and \(z\) are in meters?