Math - Calculus

Are endpoints also critical points?

I'm trying to find the critical points of a function on the interval [-1,5]. So far,the only critical point I have is 2. Does that mean -1 and 5 are also critical points?

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  1. only if it is horizontal there.
    https://www.google.com/search?q=critical+point+of+function

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  2. I hope it was not you who posted this earlier, where I explained it all.

    http://www.jiskha.com/display.cgi?id=1489049850

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  3. Yeah, how dare I ask for clarification on something I'm trying to understand.

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