Ground State energy of a particle

Estimate the ground state energy of a particle of mass m moving in the potential

V(x) = lambda *(x)^4

by two different methods.

a. Using the Heisenberg Uncertainty Principle;
b. Using the trial function

psi(x)=N*e^((- abs(x))/(2a))

where a is determined by minimizing (E)

*Note abs = absolute value