Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#1 2016-09-21 05:31:57

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 648

Fast help pleas3

Hi I have question that
Question is 2x1+2x2+2x3=0
                      -2x1+5x2+2x3=1
                        8x1+x2+4x3=1   solve by echlon fom and write correspondence eq
I solve echlon form and answer is
1 1 1 0
0 1 4÷7 1÷7
0 0 0 0                       this is row echlon plese help it to solve x1 Y1 AND z1 from ans


MZk

Offline

#2 2016-09-21 06:07:53

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Fast help pleas3

Did you use Gaussian Elimination?


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#3 2016-09-21 15:31:02

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 648

Re: Fast help pleas3

No


MZk

Offline

#4 2016-09-21 15:49:24

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Fast help pleas3

How did you get that RREF?


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#5 2016-09-21 19:10:00

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 648

Re: Fast help pleas3

I solve it by doing row operations


MZk

Offline

#6 2016-09-21 19:28:20

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Fast help pleas3

Are you aware that the system of equations you gave do not have a solution?

If I can remember, when you get your RREF you back substitute to get the answer. Why they would give you one that has no answer I do not know. Did you copy the problem correctly?


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#7 2016-09-21 19:51:58

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 648

Re: Fast help pleas3

You say that it is impossible? ??


MZk

Offline

#8 2016-09-21 19:56:17

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Fast help pleas3

Not impossible but it has no solution. In other words, there is no x1, x2, and x3 that makes all 3 equations true.

There is probably an error in copying the problem.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#9 2016-09-21 21:05:01

thickhead
Member
Registered: 2016-04-16
Posts: 1,085

Re: Fast help pleas3

Eliminating x1 from the 3 equations we get
7x2+4x3=1 and
7x2+4x3=5/3
They are inconsistent.
However if we had got same number on right hand side it would have multiple solutions.


{1}Vasudhaiva Kutumakam.{The whole Universe is a family.}
(2)Yatra naaryasthu poojyanthe Ramanthe tatra Devataha
{Gods rejoice at those places where ladies are respected.}

Offline

#10 2016-09-22 00:13:26

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 648

Re: Fast help pleas3

No I want ans in corresponding  equation mean give ans what is x1 value etc


MZk

Offline

#11 2016-09-22 01:29:06

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Fast help pleas3

Not impossible but it has no solution. In other words, there is no x1, x2, and x3 that makes all 3 equations true.

Please check that you copied the problem correctly.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#12 2016-09-22 04:08:00

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 648

Re: Fast help pleas3

Ok


MZk

Offline

#13 2016-09-22 04:29:25

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Fast help pleas3

Hi;

Or you can give me the link where the problem is posted.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#14 2016-09-22 14:06:43

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 648

Re: Fast help pleas3

That no link that assignment


MZk

Offline

#15 2016-09-22 14:36:46

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Fast help pleas3

Then just say the answer is the null set.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#16 2016-09-22 15:26:07

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 648

Re: Fast help pleas3

ok thanks


MZk

Offline

Board footer

Powered by FluxBB