# WolframAlfa/Mathematica how to find function local maximum on interval

I have a polynomial function and i want to find it's minimum and maximum on a the interval [0, 5] with Wolfram Alphaa but i forgot the proper input.

I recall it went something like so: $x^4 + x^3 + x^2 + x + n = 0$ maximum on interval $[0, 5]$, however now it just gives the output of my input and no result.

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 It seems it's no longer possible i would have to use the interactive graph but cant use that gives an error. – kellax Jan 7 at 12:22