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I need help with global minima & maxima

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I just don't understand this. What's the process to get these answers? I tried the same process as with closed interval but I was wrong. Why none, none, none, none? I'm stuck. Show me how you would do it, or any other example you put to help me understand. Any help is welcome, thank you for your answers. (EXAMPLE 2, (b)).

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I need to make my first post somewhere, so why not here.

I think it would help if you showed your attempt. Before I attempt to explain part B, let me ask you: is 0 in the interval (0, inf) and what's the closest real number to 0?

 

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