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**1. The problem statement, all variables and given/known data**

If U = 7x^2 + 9xy + 3(y^2)z, what are the components of the force vector F ?

**3. The attempt at a solution**

These are the answers I've come up with. I've gotten Fy and Fz correct, but the Fx is wrong and I'm pretty sure its actually right. However, I would love to be proven wrong lol.

Fx=-14x-9y

Fy=-9x-6yz

Fz=-3y^2