1. The problem statement, all variables and given/known data U = k(x^2 + y^2) What is the force exerted on the particle? 2. Relevant equations F = -(¶U/¶x ihat +¶U/¶y jhat +¶U/¶z khat) <--couldnt get the del symbol right determining force from potential energy 3. The attempt at a solution F = -¶/¶x[k(x^2+y^2)]ihat - ¶/¶y[k(x^2 +y^2)]jhat =-[2kx + Y^2]ihat - [kx^2 + 2ky]jhat Im new to calculus, and im pretty sure that im not doing the derivative of this right...any help would be greatly appreciated.