Re: Help on a Maths problem

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#58

From: Mot
Date: Sun, 30 Jun 2002 16:07

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Thank you for sharing this messagee on lots of newsgroups...
Theoretically, you don't have to speak english on french newsgroups : there
is no reason to post there...

The answer to your question :

you can take B very Big and :
B * (12/B) = 12
B + (12/B) > B which can be taken as big as you want...
So, there is no maximum value...

You intend to minimize a + b when a * b = 12
You have so to study f : x -> x + 12/x
and find its minimum value for x > 0...

f ' (x) = 1 - 12/x�
f ' (x) = 0 if x = sqrt(12) and this is a minimum...

So the minimum is : 4 sqrt(3)

Please : DON'T POST on FRENCH groups when you can only SPEAK ENGLISH !

(sorry for my poor english...)

--

          Mot

PS : you have to remove "ANTISPAM" in my e-mail address

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From: "Mot" <thomas.sirvent+news@ANTISPAMpolytechnique.org>
Newsgroups: alt.school.homework-help,fr.education.entraide.maths,fr.sci.maths,uk.education.maths,uw.math.mathsoc,york.mathstat.course.math2221
Subject: Re: Help on a Maths problem
Date: Sun, 30 Jun 2002 18:07:08 +0200
Organization: RHRZ - University of Bonn (Germany)
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