Equilibrium Separation?

Question

U(r) = A [ [e^((R-r)/s) - 1]^2 - 1]

with r=distance between two atoms
and A, R, s are positive constants with s<
Find the equilibrium separation R0 at which U(R) is minimum.

Answer 1

Take the derivative of U with respect to r set it equal to 0 and solve for r

Answer 2

5