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## Homework Statement

I'm looking for an explanation to something. I've attached a picture of the solution wolfram alpha is giving me.

I understand the first two zeros, +- (-1)^(1/4)*sqrt(2).

But i don't understand the other two zeros with the 3/4 power. Where does that power come from?

This isn't homework but it is course work. I thought I try some of the other problems out before diving into the actual homework and I'm already stuck lol.