BA777
Topic Author
Posts: 2048
Joined: Fri Jun 29, 2001 11:40 pm

Need Math Equations Help!

Thu Oct 03, 2002 2:21 am

Guys,

I have been given some equations to do, to work out the value of x, and im confused as to how to do the following two, any help greatly appreciated!


1) 3x divided by 2 + 5 = 8

2) 14x - 2 = 2x + 22

For Thursday!

BA777
 
777236ER
Posts: 12213
Joined: Sat Aug 18, 2001 7:10 am

RE: Need Math Equations Help!

Thu Oct 03, 2002 2:24 am

1) 3x/2 + 5 = 8.

(x by 2) therefore 3x +10 = 16

Therefore 3x = 16-10

Therefore 3x = 6

x = 2.

2) 14x - 2 = 2x + 22

Therefore 14x - 2x = 22 + 2

Therefore 12x = 24

Therefore x = 2.
Your bone's got a little machine
 
777236ER
Posts: 12213
Joined: Sat Aug 18, 2001 7:10 am

RE: Need Math Equations Help!

Thu Oct 03, 2002 2:29 am

Wait till you get onto second order differential equations!  Big grin
Your bone's got a little machine
 
KROC
Posts: 18919
Joined: Mon May 08, 2000 11:19 am

RE: Need Math Equations Help!

Thu Oct 03, 2002 3:14 am

777236ER. Where were you and this site when I had Math homework to do? I could never sucker other people into doing it for me!
 
docpepz
Posts: 1706
Joined: Thu May 24, 2001 8:20 pm

RE: Need Math Equations Help!

Thu Oct 03, 2002 3:50 am

777236ER:

No, wait till he gets to 2nd order PARTIAL non homogenoeus differential equations. Takes at least 6 pages to solve after testing the various boundary conditions and using Fourier series. blah.
 
Turbolet
Posts: 1867
Joined: Fri Nov 23, 2007 10:23 pm

RE: Need Math Equations Help!

Thu Oct 03, 2002 4:09 am

Let's put it simply, just wait till you go through 'Pure Mathematics: The Core Course for A Level'. Believe me, sometimes I have a very violent desire to tear up the bloody book! Eight months to go and then I can finally do that...
-turbolet
 
777236ER
Posts: 12213
Joined: Sat Aug 18, 2001 7:10 am

RE: Need Math Equations Help!

Thu Oct 03, 2002 4:15 am

Fourier series suck monkey ass. Find any books by D. Griffiths -- they're pure evil.

My reasoning is, dude is wily enough to ask people on an aviation website for help, he deserves top marks.
Your bone's got a little machine
 
flight152
Posts: 3211
Joined: Fri Nov 24, 2000 8:04 am

RE: Need Math Equations Help!

Thu Oct 03, 2002 4:15 am

You guys are doing it all wrong.


That formula has a HUGE flaw in it. Cramer's Law doesn't apply because to this the determinates aren't exponential to y-power (or the 45X/5F Power) unless you have the cotangent (1/tangent) sub(5/3x) equaling the curve-root of the 8/3 variable (7x cubed squared). Of course you have to first square the transponent of the acquired absolute sum of both variables, then the base integer's cotangible and triceptive coordinate (in this case 8). Try using Humplestein's Law of Compression instead, DUH! Hope that helps, makes it a bit easier.

 
707CMF
Posts: 4698
Joined: Thu Mar 14, 2002 5:39 pm

RE: Need Math Equations Help!

Thu Oct 03, 2002 4:41 am

Fourier series suck monkey ass.

Well, 777, that's just the reason why I am a computer engineer now, and not a Signal processing engineer.
Fourier indeed sucks. How could a French guy be so mean ?
 
Barcode
Posts: 666
Joined: Sat Dec 08, 2001 10:20 am

RE: Need Math Equations Help!

Thu Oct 03, 2002 5:58 am

*joins the anti A Level Maths crowd. I just got back from my three hour evening class and all the equations are a blur .... a perfect cube ... factorising ... laws of indices ... blah ...

Anyway, 14x - 2 = 2x + 22 is straightforward as someone pointed out. Just remember what you do to one side you should also do to the other ....

14x - 2 = 2x +22 - Add the (-2) to 22 so you get 24, and take away the 2x from the 14x to get 12x (try to get the variables on one side and the numbers on the other). So then you're left with 12x = 24, x = 24/12, x = 2.

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