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OT - Urgent Maths Help Needed!!!
mcerd1 - 20/1/12 at 04:09 PM

Arrgg.... its too late on a friday and my brain is dead

can anyone here solve this one for me ?

A = 4*C^2 + T^2 + 3*C*T + T*L + 2*C*L

solve for C

liam.mccaffrey - 20/1/12 at 05:05 PM

its a quadratic in c so could have 0, 1 or 2 solutions

Ill have have a go when I get home

scudderfish - 20/1/12 at 05:24 PM

10.52

iank - 20/1/12 at 05:28 PM

4*C^2 + (2L - 3T)*C + (T^2 +TL - A) = 0 (I think)

Then plug it all into the standard

rachaeljf - 20/1/12 at 05:33 PM

C = {-(3T+2L) +/- SQRT{(3T+2L)^2-16(TL+T^2-A)}} / 8

liam.mccaffrey - 20/1/12 at 05:37 PM

Wot she said ^^^^ these shoud be your 2 answers (or 1 if they are the same), the term in the square root will be negative if you have imaginary solutions






[Edited on 20/1/12 by liam.mccaffrey]

mcerd1 - 20/1/12 at 05:51 PM

cheers guys

job done

liam.mccaffrey - 20/1/12 at 06:14 PM

you have to tell us what it was for though!

the solution expression is "interesting" what it the T term

dave - 20/1/12 at 07:10 PM

Im sure the answer is WTF.

Xtreme Kermit - 20/1/12 at 08:18 PM

quote:
Originally posted by dave
Im sure the answer is WTF.


Yep. For F=0

mcerd1 - 20/1/12 at 08:32 PM

quote:
Originally posted by liam.mccaffrey
you have to tell us what it was for though!

the solution expression is "interesting" what it the T term


T = Flange Thickness

[Edited on 20/1/2012 by mcerd1]

perksy - 20/1/12 at 09:12 PM

Fair play theres some bright lads on here

SteveWalker - 20/1/12 at 11:23 PM

quote:
Originally posted by perksy
Fair play theres some bright lads on here


Normal O-level syllabus maths. I remember in the 2nd year of secondary school having a French lesson, when the teacher showed a cartoon style card with a pupil writing on a blackboard and gave us a phrase something like "Claudette est très intelligent" and the whole class chorused "Non. Claudette est stupide" as we'd all recognised the solution to a quadratic equation and spotted that it was incorrect.

SteveW

Ninehigh - 21/1/12 at 12:35 AM

quote:
Originally posted by Xtreme Kermit
quote:
Originally posted by dave
Im sure the answer is WTF.


Yep. For F=0


Good job it's not just me who thinks it might as well be a map of mars

liam.mccaffrey - 21/1/12 at 11:42 AM

I wonder how many 12 year olds could solve a quadratic these days even with the simple plug in the numbers formula.
They say that the exams are not getting easier, what a load of bull poop. I understand that logarithms are not even part of the compulsary sylabus anymore and neither is trig!?



quote:
Originally posted by SteveWalker
quote:
Originally posted by perksy
Fair play theres some bright lads on here


Normal O-level syllabus maths. I remember in the 2nd year of secondary school having a French lesson, when the teacher showed a cartoon style card with a pupil writing on a blackboard and gave us a phrase something like "Claudette est très intelligent" and the whole class chorused "Non. Claudette est stupide" as we'd all recognised the solution to a quadratic equation and spotted that it was incorrect.

SteveW

Fred W B - 22/1/12 at 11:16 AM

quote:

logarithms are not even part of the compulsary sylabus anymore and neither is trig!?


How are you going to breed any more engineers, architects, builders etc if they don't do trig in school any more?

Cheers

Fred W B