Electronics > Beginners

Exponents

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Wimberleytech:

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Isn't BEDMAS taught any more? (Brackets, exponents, division, multiplication, addition, subtraction).


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We use the mnemonic: Please Excuse My Dear Aunt Sally

ebastler:

--- Quote from: metrologist on April 09, 2019, 02:14:52 am ---Yes, thanks all. I see no reasonable solution to my problem.

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It is really simple. Due to the operator priorities which are agreed upon in mathematical notation, -34 = -(34) = -81.

If you were thinking of (-3)4, then that's what you have to write, including the parentheses. And that would evaluate as (-3)4 = 81.

Brumby:

--- Quote from: ebastler on April 09, 2019, 11:44:12 am ---If you were thinking of (-3)4, then that's what you have to write, including the parentheses. And that would evaluate as (-3)4 = 81.

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This is exactly my point here:

--- Quote from: Brumby on April 09, 2019, 02:37:31 am ---If there IS an issue with the expression, then that lies with the person who prepared it.  THAT is, actually, a much more important step than resolving it.  If it is not written correctly, then you will not - and can not - get a correct answer.

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Andrew Morton:
The - is part of the number, not an operator, so it's the same as -3 * -3 * -3 * -3.

ebastler:

--- Quote from: Andrew Morton on April 09, 2019, 02:55:47 pm ---The - is part of the number, not an operator, so it's the same as -3 * -3 * -3 * -3.

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Wow - it's brave to claim that, after about ten people have stated the opposite.  ;)
And I'm afraid it is wrong: https://en.wikipedia.org/wiki/Order_of_operations#Unary_minus_sign

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