Simplifying Quantum Mechanics with Dirac Notation

[bon]

Homework Statement

trying to simplify (using dirac notation) QM:

<E| (QH - HQ) |E>

using H|E> = E|E>

Homework Equations

The Attempt at a Solution

the textbook says that it simplifies to (E-E) <E|Q|E> = 0 but i can't see how :S

 

[tiny-tim]

hi bon!

<E| (QH - HQ) |E>

do the QH and the HQ separately …

the QH simplifies to the right, and the HQ simplifies to the left

 

[bon]

sorry got it now thanks