Finding the Inverse of an n x n Matrix

From Thinkwell's College Algebra
Chapter 8 Matrices and Determinants, Subchapter 8.4 Inverses of Matrices

[@clancamper]

"but i hope nobody would be so mean to have you do that" My professor had other plans, this is by far the best video i have seen on this subject, was about to tear my hair out. If you still here 8 years later sir, thanks, you the real king

[@AceofDlamonds]

8:20 "But boy I hope someone wont be so mean to actually have u do that" My professor: "Challenge Accepted"

[@LGLFanTeam12]

Fudging true :v

[@garvit1467]

lol nooob

[@song7087]

omg yes, 4 times 4 was actually my mid-terms test :-(

[@bintangantares2439]

6x6 really comes to my life...

[@Legend_Hunter_Original]

lol my prof did that shit when i took Lin alg1 and fk me that exam I forgot my calculator...good thing was I was pretty good at mental math back then

[@Gwenbino]

" N x N matrix" ... does it for 3 x 3 with the easiest version possible.

[@401281]

I feel like a 1x1 might be easier.

[@HL-iw1du]

This feels very 90’s. I like it.

[@wizardomri5745]

good stuff love the outfit and your personality. The 2014 video quality genuinely adds character to it too.

[@bafanankomo2503]

My lecturer is evil enough to ask us to compute the inverse using a 4x4 or sometimes a 5x5 matrix, unfortunately.

[@OmegaCraftable]

I learnt how to do this a while back and was just writing some code to invert Matrices. The code works on 3x3 matrices but not 4x4... I can't see why this would be the case if the method shown above works for nxn, as suggested in the title. Is there some explanation or have I just gone wrong somewhere in my programming.

[@401281]

I know you posted this 5 years ago, but I ran into this same issue while trying to write a linear algebra library. When you flip the signs, you can't just alternate for even matrices. you have to multiply the entry by pow(-1,i+j).

[@alisatodorova]

This was so helpful!! Thank you!

[@christopherasuncion5833]

well explained sir..thank you

[@grkuntzmd]

Nice! Thanks. "Use a computer" -- now I can write a program to do this.

[@HDitzzDH]

6:01 Wouldn’t it be easier to just say that it’s the transpose of our new matrix, aka the first row becomes the first column, the second row becomes the second column etc?

[@HL-iw1du]

GZA true

[@kingstar744]

haha true

[@ObsessiveClarity]

The way he said it is better; people who've heard "transpose" could get intimidated by it. Though I agree, after he completed it he could've remarked "some of you might recognize this as the transpose"

[@cathean19]

I like that sound effect, lol. *Cekhuk *cekhuk

[@OmegaCraftable]

Very useful. Thanks.

[@jatirijhatjhat]

thanks a mil!

[@danielg9805]

Only an infinity more matrices to invert to satisfy the title of the video

[@dsing45barrera83]

"i hope nobody so mean to put a 4by4 inverse matrix", im seeing this becouse i dont know what to di with my life and career T_T but it helped

[@samwalters7436]

At 3:27, shouldn't the determinant of that sub-matrix be -8? As, (-2*3)-(2) = -6-2, which equates to -8?

[@romanemul1]

2x0 = 2 ? since when ?

[@zenchiassassin283]

Nope it's ad-bc so 2*0-((-2)*3) so 0-(-6)=6

[@usama57926]

thank u sir

[@toochin2419]

Thanks a lot🐴

[@safaaal-moqbali2434]

hi I think it will be more easy if we first get the transposition of the matrix then get the cofactor of all the rows then * by D the determinent

[@sydneyvargas7684]

i... love you

[@kumarss6396]

it is not nxn matrix change the title