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I have a non-mathematician friend who is interested in re-learning algebra. I am more than happy to help, but I am in no position to judge what is a good introductory text --- only to identify when a text is a very bad one.

My friend is interested in starting from "basics" --- he's comfortable with order-of-operations, minus-times-minus-is-plus, and positive integer exponents. He's shaky with negative exponents, logarithms, and roots.

Any recommendations for good, freely-available resources?

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    people love to recommend http://www.khanacademy.org/, but I have no experience with it.2010-08-18
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    I assume you mean the version that isn't called "abstract algebra" and is about groups and such (Lang's book is about that) For self-study I'd suggest you take a look at the Schaum's series about algebra, they are cheap, full of examples and exercises.2010-08-18
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    I don't understand, I always thought Lang is a great book - that is what I used myself.2010-08-19
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    @muad: The question was about highschool algebra.2010-08-19
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    Oops! I was thinking of *Algebra* By Saunders Mac Lane, Garrett Birkhoff. Don't know why I confused that with Lang!2010-08-20

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Khan Academy offers dozens of videos on particular Algebra topics, among thousands of videos on other academic topics.

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Curriki is supposed to be a good resource for this kind of stuff, but I haven't tried it out myself.

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There's a pretty good video course on YouTube EDU, "College Algebra"