Classic video on inverting a 3x3 matrix part 2 | Matrices | Precalculus | Khan Academy

too much voodoo

I hate this method. But I have to learn it...

that little bit of insight you gave at the end helped. cheers.

I didn't know we could swap rows, but other than that, easy-peasy! :)

Hi, I found the way you are teaching the Gaussian Elimination method to find the inverse very confusing. First, you are using an easy 3x3 matrix to be your example. Gaussian Elimination are easy when you have an easy 3x3 matrix, but it’s not when you have fraction in the matrix. In my opinion, students are learning this method are looking for more complex method and not easy like this. Next, your steps of teaching can be more detail. It would be better if you tell students which role to minus or switch like what Michel van Biezen did in his video.

you saved my life..and my exams

This was extremely helpful!

Does this work for 2x2 matrices also?

That method, can I just call it the elimination matrix?

Wow this way is so easy till you try it on a more complex matrix lol

Part 1 was easy tbh.

what about other size matrices

Gauss Jordan Elimination Method :-
Elementary Operations Allowed
1.swap rows
2.multiply or divide each element in a a row by a constant
3.replace a row by adding or subtracting a multiple of another row to it

Didnt understand the part where you talked about the E-matrices. How are they matrices?

that was extremely helpful. Something tells me for my exam next week the prof is going to have a 3x3 or a 4x4 question.

this has been immensely helpful for my university class; I’ve tried scouring the textbook over & over but to no avail. this series of videos is clear and concise. thank you so much!

this is soooooooooo INTERESTING!!!!

Sal, THANK YOU!

Much more easier.

Lol, is gonna look a little like vodu🤣❗️🚀

I didn't understand why this works. however , can be considered as a short way of get the inverse of any matrix..

Sucked the life out of me. :(

Thank you! I'm taking OnRamps Algebra and didn't get it whatsoever with the notes provided to us. This is more of a self-taught class, so this video is a life saver!

I didnt understand any of that

Can someone help with checking the solution Identity Matrix using the multiplication of A(inverse A)=I ? I’m not getting the inverse

This is still a fantastic video for my linear algebra theory class! Thank you!

Does this process work for 4x4 matrices and/or 5x5 matrices and so on? This is super useful, and it would be great if it worked for matrices larger than 4x4.

Thank you very much for all these videos and explanations!! I'm very grateful!

thank you soo much this was super helpful

29 teachers disliked the video, left the chat and quit teaching

The elementary operations which transformed the matrix A to Identity matrix I will transform the Identity matrix I to A-1. Thanks Sal.

My lecture said we aren't allowed to use this method, we would get zero if we used it. Is this normal?

Hey, it's 2021 and these videos from 13 years ago are saving my university economics degree, thank you ❤🤣🤣

Linear algebra is such an elegant study

brilliant wow really awesome!!!

I literally confused as f

Love you sir❤️

still helping in 2022

Thanks academic

hi, I'm lucky to see this vedio. He make this easy to understand and so much fun to learn. Honestly ,i just do math as a hobby and i don't know what's for about i like math so much.
I'm doing my job is nothing to do with math. I'm a bartender. The only thing I can use math is counting beer bottles. Although the boss and costumers like me i still think a kind of wasting of my knowledge. Is any body have any ideas about what can i continue to learn or what kind of job i can look for?

2023, still useful!

Yoooo this is so much easier than the way my classes thought us, way faster! Tysm from 7th grade 💀

i find the adjoint part way easier since it is a 12th standard concept but i won't give up on this RREF form

You still gave us the Hows! I loved it

Thank you so much 🙏🏻

Thank You Sal Your are saving My Life . I am from Afghanistan And I am Learning Math For machine Learning from your Video's . God bless you