drunkenfool
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Registered: 7th Feb 03
Location: Hereford Drives: Audi R8 V8
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I only did AS maths, everyone else on teh course (physics degree) has gone A level, and i took a year out so forgotten all the stuff i knew anyway!  I got to solve (without a calculator and showing working) what x is....
3^(2x) = 5^ (x+1)
I know i got to use logs but cant remember the rules
EDIT - forgot the power sign on the right hand side!
[Edited on 18-10-2004 by drunkenfool]
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Matt H
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Registered: 11th Sep 01
Location: South Yorkshire
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this has just reminded me how much i have forgotten from school
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Sidesport
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Registered: 25th Nov 03
Location: Bath
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Basically, im not sure what the ^ means....
BUT
If that wasn't there if would simply be
3 x 2 + 3 x X then 5 x X + 5 x 1
Added togerther
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drunkenfool
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Registered: 7th Feb 03
Location: Hereford Drives: Audi R8 V8
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^ means to the power of. If only it were that simple!
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broster
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Registered: 6th Dec 02
Location: Drives: E39
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needs to do logs of both sides etc as you mentioned i could do it if i had the brain to at the moment
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Paul_J
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Registered: 6th Jun 02
Location: London
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haha if only it was that simple...
I'm in a similar boat... Only did As level, then left and did 2 years college where not much maths was used... Now doing Computer Science and have shit loads of maths to do which most of which is easy for the people (who are nearly all) that have A-level maths...
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drunkenfool
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Registered: 7th Feb 03
Location: Hereford Drives: Audi R8 V8
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a^x is x log a, but what about a^(kx) and a^(x+c) ?? Im stuck! Couldnt do the first question at all, only done half the 2nd and now stuck on the 3rd I think im gonna be doing the maths foundation course
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broster
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Registered: 6th Dec 02
Location: Drives: E39
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for - a^9kx you do: k log x
[Edited on 18-10-2004 by broster]
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broster
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Registered: 6th Dec 02
Location: Drives: E39
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i did alevel maths, then for my engineering degree i did further maths!
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drunkenfool
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Registered: 7th Feb 03
Location: Hereford Drives: Audi R8 V8
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how about...
"Differentiate the following functions of x
y= (tan x + sec x)^m where m is a positive integer I think im just gonna give up now
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broster
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Registered: 6th Dec 02
Location: Drives: E39
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pmsl, ur a fool u not got any maths books geeze! i got a really good one, and differentiation aint that hard
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Greg_M
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Registered: 2nd Sep 03
Location: Grantham, Lincolnshire
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7
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Ian
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Registered: 28th Aug 99
Location: Liverpool
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I got as far as evaluating one side at a time, then realised I can't substitute x in there as its in both sides.
This won't beat me.
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broster
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Registered: 6th Dec 02
Location: Drives: E39
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quote:
Originally posted by Ian
I got as far as evaluating one side at a time, then realised I can't substitute x in there as its in both sides.
This won't beat me.
lol, go ian go ian, i cant be arsed i have to work with maths for the rest of the week working out steam pipe expansion etc and variable supports so i will let this pass me buy
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Ian
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Registered: 28th Aug 99
Location: Liverpool
User status: Online
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quote:
Originally posted by drunkenfool
Differentiate the following functions of x
This is easy so long as you get the concept. Acceleration is to speed what an equation is to its differential form. ie. the differential is just the equation for the rate of change of something.
I think 
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broster
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Registered: 6th Dec 02
Location: Drives: E39
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yes basically you got it ian.
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drunkenfool
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Registered: 7th Feb 03
Location: Hereford Drives: Audi R8 V8
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quote:
Originally posted by Ian
quote:
Originally posted by drunkenfool
Differentiate the following functions of x
This is easy so long as you get the concept. Acceleration is to speed what an equation is to its differential form. ie. the differential is just the equation for the rate of change of something.
I think
thats right, but i need to get an answer
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