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

A potential energy function is given by U(x) = ( 3.00 N/m) x - ( 1.00 N/m³) x³. At what position or positions is the force equal to zero?

A) m and -
m
B) 0.00 m, m and -
m
C) 1.00 m and -1.00 m
D) 3.00 m and -3.00 m
E) The force is not zero at any location.