- #1
sanitykey
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Homework Statement
Verify the operator equation
(d/dx + x)(d/dx - x) = d^2/dx^2 - x^2 -1
(where d is meant to be the partial derivative symbol)
Homework Equations
None that are obvious to me?
The Attempt at a Solution
The truth is I'm not really sure how i should be going about this i tried expanding the brackets to get:
d^2/dx^2 + d/dx*x - d/dx*x - x^2
I didn't know whether having d/dx*x means i should differentiate or just leave it but i thought they'd cancel either way giving d^2/dx^2 - x^2 so where does the -1 come from?