Variational method.

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Homework Statement



In the variational method the ground state energy of a quantum system has been calculated as (ћω_o)f(λ), where f(λ) is a function of an arbitrary parameter λ. If f(λ)= λ² + λ, then what is the best estimate of the ground state energy.



The Attempt at a Solution



Is this simply (ћω_o)f(λ² + λ). As the parameters of the ground state wave function have been found which give the lowest expectation value for the ground state energy.
 

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