1. The problem statement, all variables and given/known data What is the quadratic approximation to the potential function? 2. Relevant equations U(x) = U0((a/x)+(x/a)) U0= 20 a=4 3. The attempt at a solution This is just the last part of a question on my engineering homework, I never learned Taylor expansions before even though I have taken all the class prerequisites. So if you could just walk me through it that would be much appreciated.