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Math Help - BEDMAS question

  1. #1
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    BEDMAS question

    Is the workings to this question right?

    (can't align the code properly, the last number is a fraction -4/3)

    Code:
    -(4 - (-2) ) (-3) -4 / (-4)
                                 __
                                  3
    
    = - (6) (-3) -4 / (-4)
                          __
                           3
    
    = - (6) (-3) -4 * -3
                    __    __
                      1     4
    
    = - (6) (-3) + 12
                       __
                        3
    
    = - (6) (-3)  + 3
    
    = 18 + 3
    
    = 21
    This question on BEDMAS is too confusing, is the correct answer "21"?

    Thanks.
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  2. #2
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    It's quite hard trying to read that code, since as you said, the aligning is off.

    Although, quickly glancing at it, you have 12 / 3 = 3. So just by that the answer would not be 21. In that case, it would be 22, assuming everything else is correct.
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  3. #3
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    If I read that correctly, you have:

    -(4 - -2) * -3 * [(-4)/(-4/3)],

    In which case, that equals 54.
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  4. #4
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    Thanks, Aftershock for putting on the right track. Let me try again.

    -(4 - (-2) ) (-3) -4 / (-4/3)

    The reason why the equation is written as above is that was how the question was presented.

    BEDMAS rules

    Brackets first, so:

    -(4 - (-2) )
    = -(4 +2)
    = -6

    Next is division, so:

    -4 / (-4/3)
    = -4/1 * 3/-4
    = 3

    We now have:

    -(4 - (-2) ) (-3) -4 / (-4/3)

    = -6 (-3) 3

    = 18 * 3

    = 54
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  5. #5
    MHF Contributor Quick's Avatar
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    correct

    Although I always learned the Rules in the form: PEMDAS

    Paranthesis
    Exponents
    Multiplication
    Division
    Addition
    Subtraction

    Which you can remember by:

    Please
    Excuse
    My
    Dear
    Aunt
    Sally
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  6. #6
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by shenton View Post
    -(4 - (-2) ) (-3) -4 / (-4/3)

    BEDMAS rules

    Brackets first, so:

    -(4 - (-2) )
    = -(4 +2)
    = -6

    Next is division, so:

    -4 / (-4/3)
    = -4/1 * 3/-4
    = 3

    We now have:

    -(4 - (-2) ) (-3) -4 / (-4/3)

    = -6 (-3) 3
    I disagree with this step.
    -(4-(-2))(-3) - 4/(-4/3)

    The placement of the red negative sign indicates a subtraction, not a negative sign on the 4. To multiply we would need to see parenthesis around the "-4" to group it. Thus we are not multiplying.

    -(4-(-2))(-3) + -4/(-4/3)

    -6(-3) + 3

    18 + 3

    21

    Sorry I didn't weigh in on this sooner. I couldn't make sense out of the original expression.

    -Dan
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  7. #7
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    Quote Originally Posted by Quick View Post

    Although I always learned the Rules in the form: PEMDAS

    Paranthesis
    Exponents
    Multiplication
    Division
    Addition
    Subtraction
    Thanks, Quick for coming in.

    That (PEMDAS) is interesting as it is different from BEDMAS.

    Brackets
    Exponents
    Division
    Multiplication
    Addition
    Subtraction

    As you can see, multiplication comes first in PEMDAS while Division comes first in BEDMAS.

    I'm just learning, I don't know which is correct.
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  8. #8
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    Quote Originally Posted by topsquark View Post
    I disagree with this step.
    -(4-(-2))(-3) - 4/(-4/3)

    The placement of the red negative sign indicates a subtraction, not a negative sign on the 4. To multiply we would need to see parenthesis around the "-4" to group it. Thus we are not multiplying.

    -(4-(-2))(-3) + -4/(-4/3)

    -6(-3) + 3

    18 + 3

    21
    This question is certainly tricky. When I first work on the question, I took the "-" as a subtraction and when I reworked, I took it as a negative sign.
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  9. #9
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    Quote Originally Posted by shenton View Post
    Subtraction

    As you can see, multiplication comes first in PEMDAS while Division comes first in BEDMAS.
    .
    Brackets and parantheses are the same.

    Multiplication is the same as division.
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  10. #10
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    We use BODMAS in Australia at least when I was taught it.

    O standing for Order same as exponents.
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