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48??2(9+3) = ???

BrianBrian 7,618 Posts
edited April 2011 in Strut Central
??????
«13

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  • Options
    Unknown
    288

    Parenthesis then left to right.
  • holmesholmes 3,532 Posts
    BEDMAS

    the answer is always C.

    seriously though, depending on your scientific/non-scientific calculator's way of dealing with it you will get either 8.6 or 2.
    the answer is 2.
  • dukeofdelridgedukeofdelridge urgent.monkey.mice 2,453 Posts
    ^^^^^^^^^ this!

    All day!

    For real!

    Two!
  • incompletejigsawincompletejigsaw 756 Posts
    The answer to the question is 2, but when I clicked on the thread the question then turned into "482(9+3)" and I went WHAT?! I haven't dealt with algebra in some time. But I guess this is a good reminder as I prepare for taking the PRAXIS soon.
  • BrianBrian 7,618 Posts
    WHERE DID MY POLL GO
  • waxjunkywaxjunky 1,849 Posts
    48 ?? 2(9+3)
    48 ?? 2(12)
    48 ?? 24
    2
  • Hotsauce84Hotsauce84 8,450 Posts
    F.O.I.L.
  • fauxteurfauxteur 342 Posts
    next: mean median and mode
  • Options
    Unknown
    Cheating on your GED exam is NAGL.
  • LaserWolfLaserWolf Portland Oregon 11,517 Posts
    I got 288 but I took algebra twice.
    Herm explain foil again, and I will see if I get it.

    First
    Over
    Inside
    Left?

    That's why I flunked.
  • neil_somethingneil_something 993 Posts
    LaserWolf said:
    I got 288 but I took algebra twice.
    Herm explain foil again, and I will see if I get it.

    First
    Over
    Inside
    Left?

    That's why I flunked.

    First
    Outer
    Inner
    Last

    This is used for multiplying two sets of brackets, e.g. (2a + 3)(4a - 2), not necessarily a sum like the one above. Sometimes makes more sense if you write it in a different way, such as:

    __ 48__
    2 x (9+3)
  • LaserWolfLaserWolf Portland Oregon 11,517 Posts
    waxjunky said:

    48 ?? 2(9+3)
    48 ?? 2(12)
    48 ?? 24
    2

    OK. Now I see
    First do the parenthetical addition.
    Then multiply the result by the inside number.
    Then divide.

    That gets you 2.
    Why?

    I mean, seems like you should do what I did.
    The first problem first.
    The second problem second.
    Multiply the two sums.

    How are you suppose to know the correct order?
  • LaserWolfLaserWolf Portland Oregon 11,517 Posts
    LIO?

    Last
    Inside
    Outside
  • tripledoubletripledouble 7,636 Posts
    PEMDAS!!!!!
    parentheses, exponents, multiply, divide, addition, subtraction
  • dammsdamms 704 Posts
    42
  • CinisterCeeCinisterCee 863 Posts
    waxjunky said:
    48 ?? 2(9+3)
    48 ?? 2(12)
    48 ?? 24
    2
  • incompletejigsawincompletejigsaw 756 Posts
    OK. I see how some came to 288, but where is the 42 coming from?! And I remember PEMDAS from my Algebra class, but I was trying to figure out what the P.E. part of it was again. As for F.O.I.L, that's a new one for me.
  • dammsdamms 704 Posts
    incompletejigsaw said:
    where is the 42 coming from?!
    http://en.wikipedia.org/wiki/Answer_to_the_Ultimate_Question_of_Life,_the_Universe,_and_Everything#The_number_42
  • Walter_NaglWalter_Nagl 116 Posts
    288
  • Walter_NaglWalter_Nagl 116 Posts
    24 x 12 whats the hell?
  • SnagglepusSnagglepus 1,756 Posts
    Look at it like this:

    48 ?? 2 x (9+3) =
    48 ?? 2 x 12 =

    At this point, you are left with just multiplication and division which have equal precedence in the order of operations. Therefore, the answer is 288. For the answer to be 2, the first expression would have needed to look like this:

    48??(2(9+3))

    My first instinct was to say the answer was 2 because for some reason "2(12)" seemed like it should be solved first ... but it's equivalent to "2x12" which definitely wouldn't be solved first. Ugh ... this stuff lies beneath far too much rust in my head.
  • Walter_NaglWalter_Nagl 116 Posts
    `merican school system fail:
  • Walter_NaglWalter_Nagl 116 Posts
    `merican school system fail:
  • BrianBrian 7,618 Posts
    http://forum.bodybuilding.com/showthread.php?t=133389973
  • Otis_FunkmeyerOtis_Funkmeyer 1,321 Posts
    2
    Seriously? No one knows "Please Excuse My Dear Aunt Sally" ?
    Easier to remember than PEMDAS.
  • Walter_NaglWalter_Nagl 116 Posts
  • SnagglepusSnagglepus 1,756 Posts
    Otis_Funkmeyer said:
    2
    Seriously? No one knows "Please Excuse My Dear Aunt Sally" ?
    Easier to remember than PEMDAS.

    Thing is, the "MD" part stands for "multiplication and division", not "multiplication then division". Multiplication and division are on the same rank, therefore they are done from left to right.

    So ...

    "48 ?? 2 (9 + 3) = " First, solve parentheses which leaves you with ...
    "48 ?? 2 (12) = " At this point, "2 (12)" is equivalent to "2 x 12" so you really have ...
    "48 ?? 2 x 12 = " Because multiplication and division have the same rank, you solve left to right ...
    48 ?? 2 = 24 x 12 = 288
  • SnagglepusSnagglepus 1,756 Posts
  • Otis_FunkmeyerOtis_Funkmeyer 1,321 Posts
    Snagglepus said:
    Otis_Funkmeyer said:
    2
    Seriously? No one knows "Please Excuse My Dear Aunt Sally" ?
    Easier to remember than PEMDAS.

    Thing is, the "MD" part stands for "multiplication and division", not "multiplication then division". Multiplication and division are on the same rank, therefore they are done from left to right.

    So ...

    "48 ?? 2 (9 + 3) = " First, solve parentheses which leaves you with ...
    "48 ?? 2 (12) = " At this point, "2 (12)" is equivalent to "2 x 12" so you really have ...
    "48 ?? 2 x 12 = " Because multiplication and division have the same rank, you solve left to right ...
    48 ?? 2 = 24 x 12 = 288

    Ha! American school system fail indeed!
  • waxjunkywaxjunky 1,849 Posts
    This isn't even debatable. The problem consists of two terms, 48 and 2(9+3). These are thus simplified as 48 and 24.

    This business about rewriting the problem as 48 ?? 2 x 12 would make the problem suddenly have three terms: 48, 2 and 12.

    Algebra doesn't work like that. At all.
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