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# Find the inverse of the given 3x3 matrix.

+10
651
6
+1833

Please show all working out

Find the inverse of the given 3x3 matrix.

$$Please\space show\space all\space working\space out\\ (Key\space word\space is\space all)\\ C = \begin{bmatrix} 1 && 1 && 0 \\ 2 && 1 && 0 \\ 2 && 1 && 1 \end{bmatrix}\\ \space \space \space \space \space \space \space \space \space \space What \space is \space C^{-1}?$$

Sep 21, 2016
edited by EighthMersennePrime  Sep 21, 2016
edited by EighthMersennePrime  Sep 21, 2016

### Best Answer

#1
+12288
+20

I have used the Gauss algorithm.

Sep 21, 2016

### 6+0 Answers

#1
+12288
+20
Best Answer

I have used the Gauss algorithm.

Omi67 Sep 21, 2016
#2
+110080
+15

Hi Omi,

Thanks for that great answer :))

I have seen that method uesd, and I have worked through it in parrot fashion, but I have never committed it to memory.

It is a very good method though.

There is a good you tube out there somewhere on it  because that is where I amost likely saw it used.

If anyone is interested maybe I could chase it down.  ://

On the other hand if EighthMersenePrime needs to know how to do it a different method perhaps he/she would like to say so.

Sep 21, 2016
#3
+1833
+25

If there is another way to solve this I would like to know, please.

EighthMersennePrime  Sep 25, 2016
#5
+1833
+25

Is this the similar video you found?

https://www.khanacademy.org/math/algebra-home/alg-matrices/alg-determinants-and-inverses-of-large-matrices/v/inverting-matrices-part-3

EighthMersennePrime  Sep 26, 2016
#6
+1833
+25

If you click the youtube logo on the bottom right, it should take you to the same video but on youtube, so it might be the one you found.

EighthMersennePrime  Sep 26, 2016
#4
+30591
+10

"If there is another way to solve this I would like to know, please"

Here is another approach:

.

Sep 25, 2016