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I am really not getting this Mean Value Theorem and Rolle's theorem.

I have this question

Show how that the equation x^4 + 3x + c = 0 has at most two roots.

How do I know what interval to use for Mean Value Theorem and Rolles theorem?? Think this is the part that confusses me. I think that different results can be obtained if I pick different intervals.

Please help this lost student

Peter

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# Someone please help

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