MHB Resource for learning linear algebra

Emekadavid
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I want to take some courses that involve heavy math, so I have been learning maths on the khan academy site: precalculus, calculus, statistics etc. But one fundamental area of maths the khan academy site doesn't have is a course on linear algebra. I really need to learn and use linear algebra in my work.
Can anyone point me to an online resource for learning linear algebra that is as good and concise as the khan academy site? I would love any help.
thanks
 
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Have you looked at Gilbert Strang lectures on YouTube?
 
can you send me the channel link?
 
Emekadavid said:
can you send me the channel link?
Here.
 
You can find some free textbooks here and here. I've been using "Linear Algebra with Applications" by Keith Nicholson. It's a relatively standard introductory textbook with lots of exercises and slides for each topic (you may have to request slides from the publisher). A more advanced textbook (though it also covers the material from the beginning) is "Linear Algebra Done Wrong" by Sergei Treil.
 
Thanks. Appreciate your help
 
Thread 'Determine whether ##125## is a unit in ##\mathbb{Z_471}##'
This is the question, I understand the concept, in ##\mathbb{Z_n}## an element is a is a unit if and only if gcd( a,n) =1. My understanding of backwards substitution, ... i have using Euclidean algorithm, ##471 = 3⋅121 + 108## ##121 = 1⋅108 + 13## ##108 =8⋅13+4## ##13=3⋅4+1## ##4=4⋅1+0## using back-substitution, ##1=13-3⋅4## ##=(121-1⋅108)-3(108-8⋅13)## ... ##= 121-(471-3⋅121)-3⋅471+9⋅121+24⋅121-24(471-3⋅121## ##=121-471+3⋅121-3⋅471+9⋅121+24⋅121-24⋅471+72⋅121##...
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