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Math Help - simplification

  1. #1
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    simplification

    In textbook
    r(ar) = ar^2

    but

    r(ar) = rarr = ar^3

    what?
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  2. #2
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    Quote Originally Posted by alyosha2 View Post
    In textbook
    r(ar) = ar^2

    but

    r(ar) = rarr = ar^3

    the r does not distribute over multiplication like it does for addition ...

    \textcolor{red}{r(ar) = r(ra) = (rr) a = r^2a = ar^2}
    ..
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  3. #3
    Senior Member Stroodle's Avatar
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    Quote Originally Posted by alyosha2 View Post
    In textbook
    r(ar) = ar^2

    but

    r(ar) = rarr = ar^3

    what?
     r(ar)\neq ar^3
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  4. #4
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    so how do you geot from r(ar) to ar^2?
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  5. #5
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    Quote Originally Posted by alyosha2 View Post
    so how do you geot from r(ar) to ar^2?
    r(ar) = a(rr) = ar^2
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