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Old 26th May 2012, 03:21 AM   #1 (permalink)
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How should I do it?



For question b, I got :


Do I simply ignore e^((-x^2)/8) and solve 1 - 0.25x^2=0? or how should I do it?

Edit: that equation is the differentiation of the function which I'm using to find my critical points.

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Last edited by Crazyman; 26th May 2012 at 03:23 AM.
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Old 26th May 2012, 05:12 PM   #2 (permalink)
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Re: How should I do it?

e to the power of nothing is equal to 0, so yes, ignore e^((-x^2)/8).

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Old 26th May 2012, 05:28 PM   #3 (permalink)
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Re: How should I do it?

Don't memorise that by heart though. You should understand that the logic behind it is that when you have a product of things that equal to 0, i.e. A x B = 0, either A is equal to 0, B is equal to 0, or both A and B are equal to 0. So since there's no such x where e^((-x^2)/8)=0 (implying that e^((-x^2)/8) can never be zero), 1 - 0.25x^2 must be equal to zero.

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Last edited by Betakuwe; 26th May 2012 at 05:35 PM.
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Old 26th May 2012, 07:53 PM   #4 (permalink)
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Re: How should I do it?

Are u allowed to use derivatives?

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