How to plot this function

(U0/d4)(x^4−2*x^2*d^2 + d^4) tried different codes but I can't make it work

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Can you describe the notation?
what ranges for your variables? Are both d and x variables? Do you want a 3D plot? Is U0 and d4 constants?
d is a known lenght, x is the position and u is a known constant. I do not know the values of d,u and x as it is not specified
The question is Make an energy diagram. Find the equilibrium points, mark these on the diagram and characterize their stability.

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