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## Homework Statement

I was never great in diffEQ, but now I have to solve this problem for physics homework and I'm pretty lost.

d^4x/dx^4 - d^2x/dx^2 + a =0

Where a is a parameter.

## Homework Equations

## The Attempt at a Solution

I have tried solutions like e^kt which work accept for the parameter a. The problem asks specifically what happens if a varies, so I cant even treat it like a constant