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Math Help - Trouble understanding simplification of algebraic statement

  1. #1
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    Trouble understanding simplification of algebraic statement

    Hi all,

    I am just working through an algebra example in a book and I can follow the multiple lines of simplification of the statement all of the way until the last line.

    Without specifying why, it states:



    And I just can't see how the right hand statement is derived from the left.
    Can anyone shed any light?

    Thanks for reading.
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  2. #2
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    Quote Originally Posted by Iain View Post
    Hi all,

    I am just working through an algebra example in a book and I can follow the multiple lines of simplification of the statement all of the way until the last line.

    Without specifying why, it states:



    And I just can't see how the right hand statement is derived from the left.
    Can anyone shed any light?

    Thanks for reading.
    They take out the common factor of n_x^2 in the last 2 terms, then rearrange the order they're written.
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  3. #3
    Super Member Bacterius's Avatar
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    Hi,
    This is obtained by factorizing out the n_x^2 term

    EDIT : too slow
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  4. #4
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    Ah, I see. Thanks for that, ProveIt and Bacterius.
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  5. #5
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    In other words, as easy as x - xy = x(1 - y)
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