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Math Help - Equivalence

  1. #1
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    Equivalence

    Which two equations are equivalent?

    lxl = -5

    x = 5

    lxl = 5

    x = l5l
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  2. #2
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    Re: Equivalence

    Quote Originally Posted by thamathkid1729 View Post
    Which two equations are equivalent?

    lxl = -5

    x = 5

    lxl = 5

    x = l5l
    first equation is always false ... |x| \ge 0 for all real x

    so, that leaves you three equations to think about.
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  3. #3
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    Re: Equivalence

    so it must be the 2nd and the 4th!
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  4. #4
    Member sbhatnagar's Avatar
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    Re: Equivalence

    Quote Originally Posted by thamathkid1729 View Post
    so it must be the 2nd and the 4th!
    Yeah, that's right!
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