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Bart

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Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
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27th Oct 04 at 13:26

I have to find the partial fraction of:

1,
6X^2 + 8X + 16
(X+2).(X^2 +4)

2,
6X^2 + 8X +16
(X+2).(X+4)

Its the top line divided by bottom line. and obviously X is a letter and not mean to be Times.

Can Anyone help me?

Ditch

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Registered: 29th Nov 02
Location: St Albans Drives: JDM Celica GT4 WRC
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27th Oct 04 at 13:38

Nismo

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Registered: 12th Sep 02
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27th Oct 04 at 13:40

square route of 66

Bart

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Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
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27th Oct 04 at 14:04

c'mon, dont take the piss guys

can ya show the working out too

RichiesCorsa

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Registered: 15th Feb 04
Location: Rural Perthshire
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27th Oct 04 at 14:21

(6x^2+8x+16)/( (x+2).(x^2+4) ) = A/(x+2) + Bx+C/(x^2)

Cross Mulitply:

6x^2+8x+16= A(x^2+4) + (Bx+C)(x+2)

6x^2+8x+16= Ax^2 + 4A + Bx^2 + 2Bx + Cx + 2

Then equate coefficients to find A, B and C.

Then express in the original form, substituting what you got for A, B and C.

purple_corsa_gls

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Registered: 25th May 04
Location: Near Sunderland
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27th Oct 04 at 14:23

I was thnking the same, but didnt want to put myself in a position of embarassment if i was wrong

RichiesCorsa

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Location: Rural Perthshire
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27th Oct 04 at 14:24

Bart

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Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
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27th Oct 04 at 14:28

quote:
Originally posted by RichiesCorsa

Then equate coefficients to find A, B and C.

Then express in the original form, substituting what you got for A, B and C.

umm.. and that means?

help lol
can you do it for me?

pweeease

Rob H

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Registered: 28th Oct 00
Location: Staffordshire Drives: Astra SRi
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27th Oct 04 at 14:28

(6x^2+8x+16)/( (x+2).(x^2+4) ) = A/(x+2) + Bx+C/(x^2+4)

Being pedantic

purple_corsa_gls

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Registered: 25th May 04
Location: Near Sunderland
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27th Oct 04 at 14:29

What ever happned to doing your own work, like when i was a lad?

Rob H

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Registered: 28th Oct 00
Location: Staffordshire Drives: Astra SRi
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27th Oct 04 at 14:30

quote:
Originally posted by Bart

quote:
Originally posted by RichiesCorsa

Then equate coefficients to find A, B and C.

Then express in the original form, substituting what you got for A, B and C.

umm.. and that means?
help lol
can you do it for me?

pweeease

FFS

.

What you doing to need to answer this anyway?

RichiesCorsa

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Registered: 15th Feb 04
Location: Rural Perthshire
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27th Oct 04 at 14:31

Ooops...ma bad

A=3.5 B=2.5 C=3

thats if I've done it right

Bart

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Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
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27th Oct 04 at 14:44

i guess all thats just for question 1?

RichiesCorsa

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Registered: 15th Feb 04
Location: Rural Perthshire
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27th Oct 04 at 14:50

Yeah. For Q2 do the same but use B instead of Bx+C.

Bart

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Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
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27th Oct 04 at 14:55

i wish i understood this

Dan B

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Registered: 25th Feb 01
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27th Oct 04 at 15:01

The answers I get (but it has been a LONG time):

Q1.

(3x+2)/(x^2+4) + 3/(x+2)

Q2.

12/(x+2) - 40/(x+4) + 6

chadjpr

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Registered: 27th Dec 02
Location: Chesterfield
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27th Oct 04 at 15:17

wheres barney when you need him?

Bart

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Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
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27th Oct 04 at 15:29

everyones answers seem to be slightly difference

Bart

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Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
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27th Oct 04 at 15:37

quote:
Originally posted by Dan B
The answers I get (but it has been a LONG time):

Q1.

(3x+2)/(x^2+4) + 3/(x+2)

Q2.

12/(x+2) - 40/(x+4) + 6

If only someone could elabourate exactly how he got to that

Bart

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Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
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27th Oct 04 at 16:22

kinda get it now, can anyone explain the second question?

Mikorsa16v

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Registered: 2nd Sep 02
Location: Burgess Hill, West Sussex
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27th Oct 04 at 17:33

you shouldnt be doing that subject fella, or get extra help! not being funny, but my algebra module at uni was fecking hard, went to the extra classes and it really did help

Bart

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Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
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28th Oct 04 at 06:21

quote:
Originally posted by Mikorsa16v
you shouldnt be doing that subject fella, or get extra help! not being funny, but my algebra module at uni was fecking hard, went to the extra classes and it really did help

Im not really doing maths on its own, im doing Mechatronics day release, and i have 2 hours of maths each day, as well as other subjects.

When i got home i realised i had already done the questions... but i got a slightly different answer i think.

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