Question: solve command with assumptions

Hello :-)

I am trying to solve a third degree polynomial with assumptions, but I do not understand Maple's answers.

I think I am not doing it ''correctly''.

Can someone please help me understand why Maple gives me these answers and how I could get the ones that Maple gives me when I fix a value for my parameter ? Please have a look at the attached file :

I hope my questions are clear, please don't hesitate if you need clarifications.

Thank you very much for your help and your advices.

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