A-Level Further Maths: C6-10 Inverse Matrices: Finding the Inverse of a 3x3 Matrix

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[@jakecard981]

Still coming back for last year of uni. This man is a god send

[@pedrumsalimi3466]

you actually did this better than my Uni videos released for the same thing,

[@kakashi2409]

i guess another way you can think of the reflecting about the diagonal is swapping the rows and columns

[@sambotting1028]

this guy has saved me for every maths exam i have taken in a levels and uni :)

[@kuzivakwashekanogwere]

Love your content

[@leonardowilhelmdicaprio999]

Thank you so much!!!

[@anish7183]

Wait if im preparing for the actual a level (year 13 core pure papers in may) you have to do this right

[@TLMaths]

Yes for yr 13.

[@anish7183]

This is soo long lool

[@jhadhiraj147]

Hello sir, is this method acceptable for CAIE A Levels Further Maths? Or should i have to use only gaussian elimination method??

[@jamminermit]

Would you be able to use Guass-Jordan Elimination, or do you have to use this method in an exam?

[@TLMaths]

Yes - any correct method should be fine. Your question has inspired me to do some videos using this method!

[@TLMaths]

Here you are: kzbin.info/www/bejne/Y2qWkGWpl5tkrpo

[@Sahil-tv3ef]

hey love your videeos i understand the video i just have one question, i know you use that + - + - + - + - + 3x3 matrix and i understand it, but i was just wondering where it came from? thank you :P

[@TLMaths]

It can be derived by solving the simulatenous equations from www.wolframalpha.com/input/?i=%28%28a%2Cb%2Cc%29%2C%28d%2Ce%2Cf%29%2C%28g%2Ch%2Ci%29%29*%28%28j%2Ck%2Cl%29%2C%28m%2Cn%2Co%29%2C%28p%2Cq%2Cr%29%29%3D%28%281%2C0%2C0%29%2C%280%2C1%2C0%29%2C%280%2C0%2C1%29%29, requiring j,k,l,m,n,o,p,q,r to be written in terms of a,b,c,d,e,f,g,h,i. It's obviously a messy derivation.

[@maxmolloy8314]

Watching this in the first year of my economics degree lol

[@nikunjpapnejja7992]

Hi I went through all your matrices videos and they were very helpful but I am not able to understand this one at all. Would you be able to help in any way? Thanks!

[@TLMaths]

I don't know what problem you're having - happy to help of course

[@nikunjpapnejja7992]

@@TLMaths Thanks for your reply. I repeatedly went through my book and your video. Finally got it. I am having some problems with application of transformations, would you be able to help? I am homeschooler, self studying for a levels.

[@TLMaths]

I'll help if I can - what's your question?

[@nikunjpapnejja7992]

@@TLMaths thanks. Please check this link. It has the question as well my solution which does not match the one given on the back in my book. drive.google.com/file/d/1OaL0rQ0D22R4o6MXn0cC9p-6KsmbG9YL/view?usp=drivesdk

[@TLMaths]

You will need to change the share settings to allow me to view it. Make sure there is nothing in the folder you don't want anyone to potentially see as you would be making it fully public.

[@jordanw9387]

If given this question in an exam, would we be able to use our calculator to find the determinant?

[@TLMaths]

I would say a hesitant yes, but you should definitely know how to find the determinant of a 3x3 matrix (unless you're just doing AS, in which case the calculator should be fine).

[@jordanw9387]

@@TLMaths Thanks for your quick responses Jack :)

[@ayeshaaz-zhara1101]

Sir,can u share the link of all matrices videos?

[@TLMaths]

sites.google.com/view/tlmaths/home/a-level-further-maths/pure/c-matrices?authuser=0

[@ayeshaaz-zhara1101]

@@TLMaths thank u so much sir.

[@LeeLarner]

how many marks is a question on this topic usually worth its due to come up on Edexcel's A Level Core Pure 1 Paper according to the advance information so need to be confident

[@TLMaths]

3 or 4 I would imagine, with one of the elements being k or similar.

[@LeeLarner]

@@TLMaths wow that seems low considering how long it takes

[@protocol2746]

@@LeeLarner if you practice it takes about 3 minutes, but yeah 3 or 4 sucks