Inverting 3x3 part 1: Calculating matrix of minors and cofactor matrix | Precalculus | Khan Academy
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- Опубликовано: 30 июл 2024
- Beginning our quest to invert a 3x3 matrix. We calculate the matrix of minors and the cofactor matrix.
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best teacher in the world!you deserve a nobel prize man,your effort is just tremendous
Maybe I'm weird but inverting a 3x3 matrix using this method is actually one of my preferred things in math so far ! :D Anyway, I can't thank you enough for these videos, helped me a lot.
Bro you saved my life, my teacher told me to learn this on our own for a project, no intervention from her. You were the only way I was gonna pass this project many thanks!
Thank you! My teacher didn’t explain it that good, and only now it’s clear
Yes, the eternally long process of matrix manipulation by hand. I still haven't mastered it without making 'silly' little mistakes. But I never thought to map it out like you have done here. it's far less messy than the method I've been using. Glad I came across your vid on this one.
A visual learner, I skipped through most of the talking and checked the resulting diagram. Very concise!
Incredible lecture on minors and Cofactors!!!!!
Dude the way u just found out to find the co factor is just amazing bro! Hands off
thanks helped!
You are amazing!
very well explained. i recommend this video
Why is it that my textbook spends 20 pages rambling on and over-complicating the subject, in what takes you less than 10 minutes to explain! Even with the car alarm, this made more sense than my $200 textbook. Thank you!
Thank you Sal.
you are amazing
Thank You...
thanks man .....
Thanx a lot I was really confused. Its my first time with matrices and I was completely lost.
Thank you.
Very very thanks😘
on changing the columns the - + - sign changes right???
We have to find the adjugate (adjoint) of the co-factor matrix and then multiply it with the determinant of the parent matrix.
Thank u very much ❤️
U're life saver
Hello can anyone please tell me what are leading principal minors? Thank you
tks bro
can u please tell which ur using for the board
thanks so much lmao my teacher explained it weird this rly helps
Ahaha starting the vid real af. Even Khan Academy hates this bullsh*t but I dont understand when you have to put the number in front of the determinant matrix like: for the 1st number (-1) putting -1[1,1,4,5] matrix. I dont know when or when not to do it.
can anybody help me saying the tricks to find determinant without expanding....😐
whats your most favorite thing to do by hand?
In the end you take the transpose of the matrix and then divide it with the determinant
you need to transpose this co-factor first right before dividing it with the determinant
goated youtube channel
Not sure if anyone is going to answer this, but- What is a matrix of minors and what does it do? And what is a cofactor matrix? Thanks!
His passive annoyance towards the matrix is genuinely making me laugh.
better than one peas frfr
Not entirely clear: which determinant are you talking about in the end? The one of the cofactor-matrix, or the determinant of matrix C?
+Anouk Fleur Oh wait, I just now saw the 'part 1'.
Wow 3.8M subscribers
Woow 4.4M subscribers
@@Docendo1121discimus acha g
is
+ - +
- + -
+ - +
- + -
applicable for 4×4 matrix? ??
Yes, but it is:
+ - + -
- + - +
+ - + -
- + - +
which app*
Can anyone say what is the current software Khan using? because i see a hand as cursor...but smooth draw doesn't show that cursor..( some where i heard that it was smooth draw)
I think it is something from Autodesk (with Premium subscription)
145k views, 4 comments...
Good explanation. But to much colours
Tried using this formula and got it wrong
We are suppose to interchange the minor diagonal
Why can’t all teachers explain like this ?
In India you don't get any calculator or computer. All by hand and brain. Even the weirdest and hardest calculations.
are you sure?
Are you robots?
So...All of this is just another way of finding the inverse of a matrix? Someone pls help!
It's -10 not 2 on minor factors
no, its 2... because its (-1*4)-(3*-2) = -4 + 6 = 2
hey i love you i wanna kiss you
sorry wrote that on axident