1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution for part a I do not know how to write it in power series form ? for part b : I chose the perturbed H' is v(x)= (1+ε )K x^2 /2 then I started integrate E_1 = ∫ H' ψ^2 dx the problem was , the result equals to ∞ !! shall I integrate in the interval [ 0,∞ ] !