Hello. This is my first time here, so let me know if I'm doing anything wrong "posting-wise." 1. The problem statement, all variables and given/known data The electric potential in a region of space is V= (260 x^2 - 180 y^2) V, where x and y are in meters. What is the strength of the electric field at (2.00 m, 3.00 m) ? x = 2.00 m y = 3.00 m 2. Relevant equations E = -grad(V) 3. The attempt at a solution E = -grad(V) = -(520(x) - 360(y)) = -(-40) = 40 I feel really stupid because it's not the right answer... What am I doing wrong? Thanks in advance!