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drpeppergal

  • 3 years ago

6x(5+7)/4-7x2+3x3 i am using PEMDAS and coming up with -5 but the right answer according to the TEAS Test book that I am studying is 13. Please explain why that this is the right answer.

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  1. matt101
    • 3 years ago
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    6x(5+7)/4-7x2+3x3 = 6x(12)/4-14+9 =18-14+9 =13

  2. drpeppergal
    • 3 years ago
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    So if subtraction comes first instead of the addition you do it ?

  3. matt101
    • 3 years ago
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    It doesn't matter which order you do addition and subtraction since they are actually the same function (subtraction is like adding a negative number). In your equation above, you can do the addition step first, though note you are adding 9 to -14, not 14. You will get the same answer. Side note: similarly, multiplication and division are similar functions since division is like multiplying by a reciprocal.

  4. drpeppergal
    • 3 years ago
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    Thanks for your help math is not my best subject and this test is really import to me. PS. Now I feel kind of dumb because now that you explained all of that I am starting to remember. :)

  5. matt101
    • 3 years ago
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    No problem - I'm happy to help :)

  6. drpeppergal
    • 3 years ago
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    Girl05 P E D M A S is your order of operations

  7. girl05
    • 3 years ago
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    so its different from bedmas

  8. drpeppergal
    • 3 years ago
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    ( ) exponents / x + -

  9. drpeppergal
    • 3 years ago
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    also know as Please Excuse My Dear Aunt Sally

  10. girl05
    • 3 years ago
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    but bedmas b=() e=exponents d=division m=multiplication a=addition s=subtraction so in pedmas what does the p stand for

  11. matt101
    • 3 years ago
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    BEDMAS and PEMDAS are exactly the same thing (B = brackets, P = parentheses). They rearrange the letters a bit to make fancy acronyms, but it doesn't make a difference. D and M can be performed in any order, and A and S can be performed in any order because, as I mentioned above, they are essentially the same operation.

  12. girl05
    • 3 years ago
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    matt101 thanks i didnt get the difference between p and b but now youve explained it to me so thanks

  13. drpeppergal
    • 3 years ago
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    I didn't know the b and p are the same thing.

  14. girl05
    • 3 years ago
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    neither did i

  15. matt101
    • 3 years ago
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    Haha well I'm glad I was able to teach you both something new

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