Use first order perturbation theory to calculate the correction to the ground state energy of a stra

Use first-order perturbation theory to calculate the correction to the ground state energy of a strange oscillator whose potential energy is V(x) = cx^4. Use the harmonic oscillator as h^2a^2 the unperturbed system and write the Hamiltonian as H = (1/2k)x^2 + (1/2)dx^2 + (1/2)cx^4 - kx^2 = H + H1. The ground state wavefunction of the harmonic oscillator is (x).