A Potential Energy Function Is Given by U(x) = (3

A potential energy function is given by U(x) = (3.00 N) x + (1.00 N/m²) x³. What is the force that is associated with this potential energy function?

A) 3.00 N + (1.00 N/m²) x²
B) -3.00 N - (3.00 N/m²) x²
C) (-0/500 N/m²) x² + (-1.00 N/m²) x⁴
D) (0.500 N/m²) x² + (1.00 N/m²) x⁴
E) -3.00 N - (1.00 N/m²) x²