mcerd1
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| posted on 20/1/12 at 04:09 PM |
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OT - Urgent Maths Help Needed!!!
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
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liam.mccaffrey
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| posted on 20/1/12 at 05:05 PM |
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its a quadratic in c so could have 0, 1 or 2 solutions
Ill have have a go when I get home
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scudderfish
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| posted on 20/1/12 at 05:24 PM |
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10.52
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iank
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| posted on 20/1/12 at 05:28 PM |
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4*C^2 + (2L - 3T)*C + (T^2 +TL - A) = 0 (I think)
Then plug it all into the standard
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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rachaeljf
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| posted on 20/1/12 at 05:33 PM |
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C = {-(3T+2L) +/- SQRT{(3T+2L)^2-16(TL+T^2-A)}} / 8
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liam.mccaffrey
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| posted on 20/1/12 at 05:37 PM |
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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]
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mcerd1
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| posted on 20/1/12 at 05:51 PM |
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cheers guys
job done 
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liam.mccaffrey
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| posted on 20/1/12 at 06:14 PM |
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you have to tell us what it was for though!
the solution expression is "interesting" what it the T term
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dave
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| posted on 20/1/12 at 07:10 PM |
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Im sure the answer is WTF. 
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Xtreme Kermit
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| posted on 20/1/12 at 08:18 PM |
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quote:
Originally posted by dave
Im sure the answer is WTF.
Yep. For F=0
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mcerd1
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| posted on 20/1/12 at 08:32 PM |
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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]
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perksy
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| posted on 20/1/12 at 09:12 PM |
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 Fair play theres some bright lads on here
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SteveWalker
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| posted on 20/1/12 at 11:23 PM |
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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
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Ninehigh
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| posted on 21/1/12 at 12:35 AM |
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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
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liam.mccaffrey
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| posted on 21/1/12 at 11:42 AM |
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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
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Fred W B
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| posted on 22/1/12 at 11:16 AM |
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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
You can do it quickly. You can do it cheap. You can do it right. – Pick any two.
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