MATRIX problem: Help needed

**lalitchugh** · June 13th 2006, 09:12 PM

Hi,

Pls help to pricved solution of the below problem.

Consider the following 3 matrices:

2 12 18
13 15 20
19 17 1

12 2 1
13 14 21
9 18 7

12 2 7
30 18 22
9 16 4

Find --> (inverse of A i.e A-1) x (B x – C)

Please mail me the solution on lalitchugh@yahoo.com

Best Regards
Lalit Chugh

**CaptainBlack** · June 14th 2006, 10:49 PM

Originally Posted by lalitchugh

Hi,

Pls help to pricved solution of the below problem.

Consider the following 3 matrices:

2 12 18
13 15 20
19 17 1

12 2 1
13 14 21
9 18 7

12 2 7
30 18 22
9 16 4

Find --> (inverse of A i.e A-1) x (B x – C)

$A^{-1} B (-C)\approx \left[ \begin{array}{ccc} -51.6&-54.6&-32.5\\ 16.9&35.7&8.2\\ -17.4&-21.9&-9.2 \end{array} \right] $

Please mail me the solution on lalitchugh@yahoo.com

No.

RonL

**topsquark** · June 15th 2006, 04:46 AM

Originally Posted by CaptainBlack

$A^{-1} B (-C)\approx \left[ \begin{array}{ccc} -51.6&-54.6&-32.5\\ 16.9&35.7&8.2\\ -17.4&-21.9&-9.2 \end{array} \right] $

No.

RonL

Or to be precise:

$\frac{1}{2602} \left [ \begin{array}{ccc}-134355&-142196&-84492\\43995&92792&21298\\-45192&-57048&-23892\end{array} \right ]$

To expand on CaptainBlack's "no," please be aware that it is better for everyone on the site to have the solution posted here so someone else who wants to learn the process can do so and ask questions about it. If the solution is simply sent to your e-mail others will not benefit as well.

-Dan

**CaptainBlack** · June 15th 2006, 05:03 AM

Originally Posted by topsquark

Or to be precise:

$\frac{1}{2602} \left [ \begin{array}{ccc}-134355&-142196&-84492\\43995&92792&21298\\-45192&-57048&-23892\end{array} \right ]$

To expand on CaptainBlack's "no," please be aware that it is better for everyone on the site to have the solution posted here so someone else who wants to learn the process can do so and ask questions about it. If the solution is simply sent to your e-mail others will not benefit as well.

-Dan

I was trying to avoid being too helpfull

RonL

**topsquark** · June 15th 2006, 11:07 AM

Originally Posted by CaptainBlack

I was trying to avoid being too helpfull

RonL

Oops!

-Dan

**CaptainBlack** · July 18th 2006, 01:24 AM

New Question about Gauss-Jordan split out from this thread into a thread of its own here

RonL

**Soroban** · July 18th 2006, 02:56 AM

Hello, Lalit!

Who assigned this hideous problem . . . Torquemada?
. . (No one expects the Spanish Inquisition!)

Given: . $A = \begin{pmatrix}2&12&18\\13&15&20\\19&17&1\end{pmat rix}\;\;B = \begin{pmatrix}12&2&1\\13&14&21\\9&18&7\end{pmatri x}\;\;C = \begin{pmatrix}12&2&7\\30&18&22\\9 &16&4\end{pmatrix}$

Find: . $A^{-1} \times B \times (-C)$

Thanks to topsquark's work, all you have to do is:

. . $\frac{1}{2602}\begin{pmatrix}\text{-}134355&\text{-}142196&\text{-}84492\\43995&92792&21298\\\text{-}45192&\text{-}57048&\text{-}23892\end{pmatrix}\,\begin{pmatrix}12&2&1\\13&4&2 1\\9&18&7\end{pmatrix}$ $\begin{pmatrix}\text{-}12&\text{-}2&\text{-}7\\\text{-}30&\text{-}18&\text{-}22\\\text{-}9&\text{-}16&\text{-}4\end{pmatrix}$

Good luck!

Thread: MATRIX problem: Help needed

LinkBack

Thread Tools

Display

MATRIX problem: Help needed

Similar Math Help Forum Discussions

Matrix equations solving help needed?

2x2 matrix - help needed!

Strictly Upper Triangular Matrix Proof Help Needed

Rotation Matrix Help Needed

Rewriting a matrix equation as a system...quick help needed :). (Differential Eqns)

Search Tags