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2003 - Paper 2 - Question 8 - HSN forum

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2003 - Paper 2 - Question 8


3 replies to this topic

#1 JiLL

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Posted 01 May 2005 - 05:00 PM

Don't worry i am the same as u!

I think optimisation i really tough going!

I was wondering if anyone could help me with 2003 Paper2 question 8!?!

I know how to do part b) but i can't seem to manage to show that the Area is:

x^2 + 432000/x

help is appreciated

thanx huh.gif
beast

#2 Dave

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Posted 01 May 2005 - 06:50 PM

the thing i think to remember here is that 108 litres is equal to 108000cm3

the surface area = 2 triangles + 2 rectangles
= 2(1/2 x 2) + 2(2lx)

the answer we are given has no mention of l so we must sub for a expression that equals l in terms of x

this is where the volume comes in

vol = 180 litres = 108000cm2
= 1/2x2l = 108000
l = 216000/x2


sub this value

x2 + 432000/x = surface area

If i am not here i am somewhere else



#3 JiLL

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Posted 01 May 2005 - 07:12 PM

thanx biggrin.gif
beast

#4 Larry

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Posted 15 May 2005 - 09:13 PM

hey oddly i had trouble with part (b) for this question, i´m not sure how to solve it after you differentiate. can you help?





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