2 semesters with this professor. One of the best math professors I've had. Would definitely take again.
@biancagallegos1059
8 жыл бұрын
This is a very straight forward example of solving for the determinant of a 3x3 matrix, I'm sure it will come in handy in the near future. Thank you.
@BeckyGooding
8 жыл бұрын
Simple and straight forward walk through, thank you for the help!
@katrinamccall9634
8 жыл бұрын
I was so confused at first because I know that is not how I learned it in my other classes, but after the second time watching it I found it to be so much easier. Thank you for this video!
@taylorfenyoe5485
8 жыл бұрын
So glad I watched this before going into the final!! I understood how to solve this in my calculator, but was having a hard time grasping how to calculate the determinant of 3 x 3 matrices without it. Thanks for sharing!
@pavmx703
11 жыл бұрын
Why did you subtract all of the red numbers instead of adding them like you did the green?
@illkp
3 ай бұрын
Bro, are you alive? And I hope you got an answer for your question
@Leonhart407
12 жыл бұрын
I was looking for this kind of tutorial! Thank you so much! :)
@acs1789
13 жыл бұрын
@NGViral The method does work for the matrix... 1 0 1 0 2 1 1 1 1 When you recopy the first two columns and juxtapose them with the original matrix, you get... 1 0 1 1 0 0 2 1 0 2 1 1 1 1 1 Multiply from upper left to lower right, you get 2 + 0 + 0 = 2 Multiply from upper right to lower left, you get 2 + 1 + 0 = 3 Now subtract 2 - 3 and you get -1. Hope this helps.
@avesta5390
2 жыл бұрын
My teacher used an extremely long and confusing method to solve this type of question. You solved it in 2 minutes. You may just be the best teacher I’ve never had…
@richardbinu7653
11 ай бұрын
14 years later and this method saved a new a level student, thx prof!
@acs1789
12 жыл бұрын
In mathematical notation, when we put the letter that represents the matrix between vertical lines, it means find the determinant. It looks like absolute value notation, but absolute value versus determinants is like comparing apples and oranges.
@knynx
8 жыл бұрын
After seeing this i understand much better how to not rely blindly on my handy dandy TI-84 graphing calculator although it is quite an useful tool. If i ever happen to find myself trying to gain access to ancient Greek city of Thebes as Oedipus once did, the Sphinx will surely ask me this as the riddle, and i am thankful for having learned this for i shall have nothing to fear on my journey.
@acs1789
14 жыл бұрын
It is a shortcut for 3x3 systems only. One could also do cofactor expansion, which would be applicable to any old system, 3x3 or otherwise.
@zaidcruz
8 жыл бұрын
With this tutorial now i do not have to rely on the calculator. Awesome.
@mestbesokt
10 жыл бұрын
this formula is going to save me a lot of time on my exam! Thanks bro;)
@ethanojala832
3 жыл бұрын
Thank you! In my math classes it was referred to as "spaghetti math" and we did it so often that I only wrote it down once. Can't find the note now, but you covered it perfectly!
@diegoarias5096
8 жыл бұрын
Great video professor, this was very helpful! Thank you very much
@acs1789
11 жыл бұрын
Yes, although when you're finding a cross product and set it up in "determinant" form, it's not a real determinant but a device to help remember the formula for the cross product of two vectors.
@paulinasanchez-limon6623
8 жыл бұрын
This video helped me understand the topic a lot more. Thank you professor !
@Realswagoverlord
7 жыл бұрын
Thank you, this method is so much more simple than what they teach us in the textbook. Rest in peace Harambe.
@saba1787
3 жыл бұрын
I wish you would put up a course on matrices.....love the way you teach and diagrams are excellent
@carolinaocana92
8 жыл бұрын
This was very helpful, thank you Professor!
@IrshadKhan-ni7op
8 жыл бұрын
hamm
@ericnana1400
6 жыл бұрын
.
@acs1789
14 жыл бұрын
@JimmyFox01 It can be used, for example, in Cramer's Rule (i.e. solving a system of linear equations multiple unknowns.)
@vjsookdeo
14 жыл бұрын
@JimmyFox01. The purpose of the determinant is to determine whether of not a matrix has an inverse: A matrix has an inverse if and only if its determinant is not zero.
@josefita1567
3 жыл бұрын
Thanks for the video! My favorite way of calculating the determinant for a 3x3 matrix yet I always forget it lol
@ieotos
11 жыл бұрын
Your solution is wayy simplier and easier than the teacher taught in my univ.. Thank you so much this will help me alot in my exams
@sammicale4943
7 жыл бұрын
I love this guy! He makes math fun!! I'm taking calculus and he really knows how to explain the material.
@drinkingineasterneurope6947
7 жыл бұрын
dunno what was so fun in the this video it was fine but cant say fun
@taekook_army4483
6 жыл бұрын
This isn't even calculus , it's algebra, tf ?
@chottoshikh2444
6 жыл бұрын
Samei Micale hello
@naumanalvi7421
6 жыл бұрын
are you engineer
@ashidilkhan
12 жыл бұрын
sir very very nice. you created a new idea very easy God Bless you
@valerieservin6787
8 жыл бұрын
Great video, professor! Very helpful and now I feel ready for the final exam!
@automaticSOM
12 жыл бұрын
For a 4*4 matrix you can use the gauss jordan method, which works for any nxn matrix. As for 3*4 matrices, they have no determinant. Determinant is a quantity associated with square matrices only ( ie n*n matrices)
@acs1789
13 жыл бұрын
@abarashyasir1 It only works for 3 x 3 matrices. For 10 x 10, you would have to use something like cofactor expansion (or a graphing calculator).
@dennisreardon8879
8 жыл бұрын
This is a big help for the test tomorrow thanks.
@nilimamacha4034
4 жыл бұрын
I'm trying to learn this from 6 weeks.Now I got it sir
@gabrielmunguia7041
8 жыл бұрын
this video really helped me, thank you professor
@acs1789
12 жыл бұрын
How did I calculate 2 x 0.5 x 5? It's just arithmetic that the product of those numbers is "5". Similarly, 7 x 0.5 x 6 is 21 just as we learned in basic arithmetic.
@ianferguson4429
8 жыл бұрын
This material is golden
@gustavorodriguez7189
8 жыл бұрын
Easier method than the one I was previously thought.
@anaelias52
8 жыл бұрын
Great way to explain this concept!
@alinaolmos5265
6 жыл бұрын
This was very helpful! Thank you very much this saved me for my test tomorrow!
@jovannyastorga263
8 жыл бұрын
Thanks, this this is a great technique and helped a lot.
@ezequielsoltero9082
8 жыл бұрын
Well explained and helpful!
@sharvey702
12 жыл бұрын
i forgot how to solve determinants. this video helps me to remember. thanks a lot. i made it. i remember now
@acs1789
14 жыл бұрын
@nz109304 This method is perfectly acceptable providing that it is a 3 x 3 matrix. Anyone who passed an elementary linear algebra course would know that. However, it would be wrong to attempt this on a 4 x 4 matrix, for example. Cofactor expansion is the proper methodology for a general n x n matrix.
@291094alex
12 жыл бұрын
thaaaaaaaaaank youuuu he even explained it better than my teacher
@Bruce_Wesley
8 жыл бұрын
Awesome! After watching this video I'm ready for the easy final exam! I won't have to pray to the rabbit God for help
@xihuneltgranados5266
8 жыл бұрын
thank you! hopefully it will help me with my exam tomorrow
@mr.danielolivobapctcna8322
11 жыл бұрын
You've explained well. Thank you.
@astroKidLo
2 жыл бұрын
this was the "trick" i was looking for but honestly, cofactor expansion is just easier for me. I always forget the signs on this one. the signs on cofactor expansion are easier to remember for me
@jensmalzer6344
Жыл бұрын
SHUT UP NERD - PUSHES U INTO A LOCKER- GIMME UR LUNCH MONEY KID!
@Maria-nl1xi
8 ай бұрын
thanks for the informative video, you really helped me out
@frankytaylor720
11 жыл бұрын
I have few questions . 1-What exactly is a domain in 4 number matrix showing us? (I think in 3 number it could be volume but 4th and higher?! Time-space...) Please clarify. 2-in three number what each set shows? Coordinates? Do we put x coordinates in one row? Thank you.
@omarsherif5478
8 жыл бұрын
Great video, i feel ready for my final exam now!!
@BariCM
14 жыл бұрын
the way I learned it was like this, except that there are supposed to be parentheses around the "red" values. Don't know if that changes anything....
@eletiy
11 жыл бұрын
perfectly explained, thank you sir.
@acs1789
13 жыл бұрын
@NGViral It does work for this matrix. Carefully check your arithmetic.
@anmunor
8 жыл бұрын
I found this Helpful for tomorrow test, thanks. Antonio Munguia
@Captainmop
12 жыл бұрын
That's the general formula for finding the determinants of matrices. This is just a faster way of solving 3x3 matrices specifically.
@monserratmoreno3933
8 жыл бұрын
Ohhh so that's how you do that, I think i missed a bit of that on my notes and was a bit confused thank you professor that makes it much easier.
@seanalbert5746
9 ай бұрын
If you plan to do Differential Equations, this is the way to go folks, not the usual 3 part (+ - +) equation. Even though my teachers for Statics, Dynamics and Differential Equations used this method, I persisted in using the equation I was taught because that's what I had practiced. It works fine for me until I had to find eigen values in DE where you have some 2-term multiples in a 3x3 matrix. During the stress of my third test, I kept making Alg. mistakes in working out the equation method, so I could never find my eigen values which is only the first step in the problem which was worth 15 points. Since my teacher gives partial credit, I showed him I knew how to do the rest of the problem by giving the eigen values variables and then showing him what I would do if the values were distinct & real or if the values were repeated (the third "unreal" values possibility was already demonstrated on another problem on the test). He graciously gave me 12 out of the 15 points. Studying for the final now and I'm finally trying this and seeing how much easier it is. .... The End
@pehlunthg
11 жыл бұрын
finally i found it here. its not even in the text book. Thank you very much.
@RandarserousRex
11 жыл бұрын
Amazing video very well done. also very very neat handwriting.
@ana3477
8 жыл бұрын
As promised! I've watched the video and I'm leaving a comment. This is neither good nor a bad comment, but - is it too late for extra credit?
@brainteasercentral590
2 жыл бұрын
Thanks for this video. It helped me a lot
@wharvey296
9 жыл бұрын
So helpful making it seem way easier than my lecturer haha
@WastedSmiley
13 жыл бұрын
i was told to multiply the colors that are the same, then subtract them from the different color for the determinate?
@LupaiLupai-li6tx
Жыл бұрын
I really thanks u for ur teaching.
@mendelinalopez4891
8 жыл бұрын
Thank you professor! -Mendelina Lopez
@acs1789
13 жыл бұрын
@jcpotter56 Actually, the numbers you see in the matrix represent coefficients, so those numbers you have on the right side of the 3 equations you wrote would really be coefficients on the variable "z".
@vand9261
8 жыл бұрын
Thanks for the tips Professor.
@diegosalido449
8 жыл бұрын
Great video professor!
@newzadmohamed717
10 жыл бұрын
would you please be able to make a video on how to find a variable in matrix? thanks
@carellano5136
8 жыл бұрын
Thanks for sharing Professor!
@woo216
13 жыл бұрын
to find the eigenvalues of a 3 by 3 matrix can i reduce the matrix to row echlon form and subtract lambda from the diagonal then multiply the diagonlas across
@nuhluosman9008
4 жыл бұрын
Thank you very much . Great explanation
@biancamarrujo2151
8 жыл бұрын
Cool! Ready for the exam now! Thanks.
@aaronbaltazar1731
8 жыл бұрын
Great video really helped me with my work! My name Aaron Baltazar im in your Math 101 class at 1030 TTh
@acs1789
14 жыл бұрын
I did not have a calculator, but I worked it out on paper first and had the paper just off to the side off camera so I did not have to do the calculations in my head.
@Study_wallah01
Жыл бұрын
Prof. This trick is really work..??
@JimmyFox01
14 жыл бұрын
great trick, but what is the application of the determinant, i mean how can we use it?
@cirina3
13 жыл бұрын
This is very right its very correctand i even learn it at school. it will come in my quiz tomorrow :) thank goodness it's easy because of this video. I have the worst teacher for algebra. the teacher's explanation is sooooo hard and the teacher doesn't want questions :S
@eduardoramos1547
8 жыл бұрын
Great video, very helpful
@Plecz
10 жыл бұрын
Thanks! This makes it much faster when trying to solve a system of equations!
@niteshsonal8905
7 жыл бұрын
Thanks man. That was really helpful. Nice job👍👍
@juns1992
13 жыл бұрын
Is this really work? I just checked the answer by doing it in proper way, it didn't give same answer as you gave and I've never heard about cramers rule. Can you give a example that compares answer by doing cramers rule and one that doesn't or proof of cramers rule? because I think cramer's rule is wrong
@murcielagorider
8 жыл бұрын
Hey professor great video!
@JuneWind2009
13 жыл бұрын
Thanks, really helped with my Calculus. I forgot how to do it.
@skylerholzman3874
5 жыл бұрын
it's 1:30 am and god bless this video for all it's worth
@brashboy0403
14 жыл бұрын
very well done and nicely explained 10/10
@FRSD619
8 жыл бұрын
this helped so much thank you!
@jcpotter56
13 жыл бұрын
sooo would the equation from the beginning(Q=) be 2x-4y=7 8x+1/2y=3 6x-9y=5 ...? need an answer fast plz!
@olivaserna7805
8 жыл бұрын
How are ya? Awesome helpful video!
@Captainmop
12 жыл бұрын
The aim of this isn't to solve the system, it's to find the determinant of the system. If you want to find the solution to a system, try using Cramer's Rule.
@asimaarunima9678
4 жыл бұрын
Is it valid for only 3*3 matrix..or any order matrix?
@waffledude111111
12 жыл бұрын
Thank you sir that was Great help, I can do my assignment now.
@bishalnepal1232
6 жыл бұрын
what he did wrong was you are supposed to add the same diagnols and subtract the other ADDED diagnols he subtracted the SUBTRACTED diagnols if you get what i mean
@drswish629
6 жыл бұрын
Woah! Your good
@acs1789
11 жыл бұрын
Yes. Or you could use cofactor expansion.
@v.cloud9
8 жыл бұрын
Interesting approach, thanks :) and don't worry, you won't have to wait for me in order to begin the exam tomorrow, 'cause I'll be there on time haha just kidding I'll probably be late
@acs1789
8 жыл бұрын
Oh, darn.
@cieloaces.casauran3832
4 жыл бұрын
Can I use this technique for 5 by 5 matrix ?
@qufluna
7 жыл бұрын
i tried twice w this method to find determinant but my ans not the same when i use laplace expansion. are you sure this is a right method?
@renuprakash9995
7 жыл бұрын
it is the right method . i got the answer right. please try again
@robbybobby6464
12 жыл бұрын
wouldnt it just be 378 cuz its absolute value??? im confused
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