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Offline yasser37

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p3 doubt
« on: April 26, 2011, 04:01:17 pm »
Hi all

in June 10 p31
Question 9
Part 2

I keep getting x=1
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Offline EMO123

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Re: p3 doubt
« Reply #1 on: April 26, 2011, 04:03:41 pm »
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Offline yasser37

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Re: p3 doubt
« Reply #2 on: April 26, 2011, 06:17:41 pm »
that's what I did  ??? ???
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Offline SkyPilotage

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Re: p3 doubt
« Reply #3 on: April 26, 2011, 08:25:30 pm »
Hmm. You equated the answer in part i to zero right?
You have to equate the derivative of part i to zero and ulll get the right answer! Because if u equate part i to zero its as iff ur finding the x-coordinate when the normal to the curve is horizontal! but the want the x-coordinate when the normal's gradient is maximum not equal to zero! I hope u got it.
« Last Edit: April 26, 2011, 08:27:55 pm by SkyPilotage »
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Offline yasser37

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Re: p3 doubt
« Reply #4 on: April 27, 2011, 03:54:55 pm »
I differentiated the answer in part one and equated to zero
maybe am doing something wrong :S
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Offline SkyPilotage

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Re: p3 doubt
« Reply #5 on: April 27, 2011, 05:55:53 pm »
Would you like to show me your working?
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