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Math Help - Hello, newbie needs help.

  1. #1
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    Hello, newbie needs help.

    29- { 5+3 [ 8 x (10 - 8 ) ] -50 }

    I do not understand this. This is not offical homework, but I don't want to get behind. Also what do these { } mean
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  2. #2
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    They are just another way of expressing paranthesis.

    Something written like this doesn't look very good.

    (5+(((2*3)-1)+7^3)-1) Woah!

    So we use other kind of brackets sometimes.

    Now to your question.

    You have:{ 5+3 [ 8 x (10 - 8 ) ] -50 }

    Use PEMDAS or order of operations

    1. {5+3[8 \times (10-8) ] -50}
    2. {5+3[8 \times (2)] -50}
    3. {5+3[16]-50
    4. {5+48-50}
    5. 3 There's your answer!
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  3. #3
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    What about the 29-
    29-{ 5+3 [ 8 x (10 - 8 ) ] -50 }
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  4. #4
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    Ooops! Didn't see that. Then it's 29-3=26
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  5. #5
    MHF Contributor Quick's Avatar
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    I would just like to point out Jameson, that you can wright brackets with Latex:

    \{ 5+3 [ 8 x (10 - 8 ) ] -50 \}
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  6. #6
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    I my self prefer to use the singe parantheses, ( )
    The other [ ] can be confused with greatest integer function.
    And never try to use { } because it deals with sets which are divine.
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  7. #7
    MHF Contributor Quick's Avatar
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    Quote Originally Posted by ThePerfectHacker
    I my self prefer to use the singe parantheses, ( )
    The other [ ] can be confused with greatest integer function.
    And never try to use { } because it deals with sets which are divine.
    Of course, considering barbienut doesn't know greatest integers and divine sets (neither do I for that matter) I don't think it's really relevant what you think

    although, I personally agree with you. I think it's sort of fun (although I don't think anyone else agrees with my) to figure out which paranthesis pair up. I've also become good at it by using excel.
    Last edited by Quick; August 22nd 2006 at 06:29 PM.
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  8. #8
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    Hello, barbienut75!

    I have questions about what you wrote . . .

    . . . . . . . .
    I assume this is "times"
    . . . . . . . . . . . . . . \downarrow
    . . . 29 - { 5 + 3 [ 8 x (10 - 8 ) ] - 50 }
    . . . . . . . . . . . \uparrow
    . . . . . . .
    but is this also "times"?

    If so, I can explain the procedure.


    Start within the "innermost" grouping symbols.

    We have: . 29 - \bigg(5 \:+ \:3\cdot[8\cdot\underbrace{(10 - 8)}] \:- \:50\bigg)
    . . . . . . . . . . . . . . . . . . . . . . \downarrow
    . . . . . . = \;29 \,- \,\bigg(5 \;\;\;+ \;\;\;3\cdot\underbrace{[8\cdot2]} \;\;- \;\;50 \bigg)
    . . . . . . . . . . . . . . . . . . . . . \downarrow
    . . . . . . = \;29 \:- \:\bigg(5 \quad+ \quad\underbrace{3\cdot16}\quad- \quad 50\bigg)
    . . . . . . . . . . . . . . . . . . . . \downarrow
    . . . . . . = \;29 \:- \:\underbrace{\bigg(5 \quad + \quad\;\;48\quad\;\; - \quad50\bigg)}
    . . . . . . . . . . . . . . . . . . . . \downarrow
    . . . . . . = \qquad\underbrace{29 \qquad\, - \,\qquad 3}

    . . . . . . = \;\qquad\qquad\;\;\boxed{26}

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