Linear Algebra: Simpler 4x4 determinant

[freedomisflight]

42 is always the answer, what did you expect :D

[Rand0mDeath]

I don't get why he puts minus signs when switching rows....I usually never put them before. Do you have to put them only when you find determinants???

[newcollegebuddy]

This is really good sir. Thanks a lot for your tutorials



[taekwonwelchify]

its 12:30 am, i got my test at 8 am, and i COULD NOT figure out where those negative's (from swapping rows) were coming from... id be doomed without this video, thank you!!!

[Bulliondon]

Perfect explanation, precise and to the point.. .Great Job!

[LadyAlchemy94]

you sound like tom hanks btw :D

[LadyAlchemy94]

YOU SAVED MY LIFE

[adisamun]

wow, dude your absolutely amazing. thankyou

[sfkc1588]

Ah that's what my teacher was talking about. The only words I picked up were triangle, zero and matrix but now I know what to do. Thanks!

[sytahr]

seriously, who negs khanacademy...

[ericp3371]

Dear khanacademy, thanks fo your many videos, I have gotten through first and second year engineering at the top of my class. I think I'd be at the bottom if it wasn't for you :) Cheers for your good deeds.

[Thipok30386]

Does it really works? Its looks too easy...

[99crt]

ty............................­

[andregascoigne]

fantastic - thanks heaps :D

[meki4life]

win

[Transgressor100]

amaaaaaazing



[TheMusicalTurtle]

Why can't you be my professor?

[MatthewHudghton]

after you swapped the rows, if you swapped another 2 random rows would the determinate be posative again , minus minus

[mybrotherstolemypen]

WHAT IF I SWITCH ROWS AGAIN?would that make the matrix go back to being positive?

[caiosm1005]

@mybrotherstolemypen yes

[JTEtheReturn]

Bob Ross of science ...

[RICExCRISPY]

it.all.makes.sense.now. :D!!!!!!!!! My teacher is just plain horrible when it comes to this stuff. thanks so much!

[Brute4Force]

2.134 videos WTF!

thx for this video just what I need it xD

[Mrchinner]

exchanging position are only for rows?? or can possibly be done also in columns.? how can we know if that's the right column or row to be exchanged?

[Mrchinner]

exchanging position are only for rows?? 

[cuk2uk]

ur the best thx -.-

[enjoyablesounds]

I don't understand why you wrote a minus after the row exchange..If i'm not mistaken you are just old fashioned row reducing right? Or is it a standard rule that when figuring out determinants you must switch signs when exchanging rows?

[neethux]

@enjoyablesounds standard rule

[shiningyrlife]

@enjoyablesounds according to him, when u change row, the determinant of the matrix after changing is negative of the determinant of the matrix before changing row. That why u put a minus sign.

[aljonloveiguibone]

U can't use this when one of the said diagonal is zero...

[allaroundfilms]

Does this work for any n x n matrix? Or does it have limitations?

[Mega12475]

Words can't describe my appreciation for you!!!

[LagartoNET303030]

Awesome !!! =D

[Ch1mp90]

Nice stuff! If I'm correct, than this is the same method that's used in the Gaussian Elimination method, right?

Anyways, a huge thank you for this vid, my ass is saved :D

[missgoonygirl]

cool stuff you are the best...

[shitanywhere]

when u changed 6 to 0, can you use either row 1 or 2?or just row 2??

[amjPeace]

I haven't thought about matrices since the sixties. Thanks very much for helping me clear the cobwebs!

[yynotx]

i see a lot of value in the occasional application video that recaps concepts--thanks

[Flake4kv]

i dont want to insult u but u and math are two different worlds......

[ebsanu]

great vid man.

Are you a teach, if not you really should be.

[sheheryar25]

awsome ! keep up!

[andreiduffy]

i needed this, thank you