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p3 doubt

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yasser37:
Hi all

in June 10 p31
Question 9
Part 2

I keep getting x=1

EMO123:
You should post these doubt at this link
https://studentforums.biz/math-146/p2-and-p3-doubts-here!!!!!/

yasser37:
that's what I did  ??? ???

SkyPilotage:
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.

yasser37:
I differentiated the answer in part one and equated to zero
maybe am doing something wrong :S

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