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Comment on A - ( B x C ) + ( D x E ) = A - ( B x C ) - ( D x E ) if A > B + C + D + E

Arkouda@lemmy.ca ⁨23⁩ ⁨hours⁩ ago

The brackets are used to make the equation look cleaner, and the issue for declaring the statement true was doing Addition and Subtraction in the wrong order.

A - ( B x C ) + ( D x E ) = A - ( B x C ) - ( D x E )

Using your example:

10 - 1 + 1 = 10 doing the subtraction first. 10 - 1 + 1 = 8 doing the addition first.

When doing the other side of the equation:

10 - 1 - 1 = 8 regardless of order because it is all subtraction.

By doing it out of order and incorrectly I was able to make my statement true that as long as A was greater than the sum of B-E both sides would be equal.

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SmartmanApps@programming.dev ⁨19⁩ ⁨hours⁩ ago

The brackets are used to make the equation look cleaner

No, they’re used to show deviations from the usual order of operations. If I want 2+3x4 to equal 20, then I have to write (2+3)x4.

10 - 1 + 1 = 8 doing the addition first

No it isn’t. 10+1-1=11-1=10 is addition first. Note same answer, You did 10-(1+1) - you added brackets which changed the answer, thus a wrong answer

10 - 1 - 1 = 8 regardless of order because it is all subtraction

Not all of it. You’re forgetting the 10 is really +10. -10-1-1 would be all subtraction. +10-1-1 is addition and subtraction.

it is not the same regardless of order

Yes it is! 😂 It is always the same regardless of order, as I have just shown you, again.

10-1+1=9+1=10

10+1-1=11-1=10

-1+1+10=0+10=10

1-1+10=0+10=10

1+10-1=11-1=10

-1+10+1=9+1=10

you do it left to right making it incorrect to do 1-1 first.

It’s NOT incorrect to do 10-1+1. It IS incorrect to do 10-(1+1), which is what you did

By doing it out of order and incorrectly I was able to make my statement true

It was solely because you did it incorrectly. Order doesn’t change anything.

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- Arkouda@lemmy.ca ⁨19⁩ ⁨hours⁩ ago
  I am not going to argue with you about it. This was resolved almost a month ago.
  
  Read the original equation again, plug some numbers into it, and try again. If that doesn’t help, read the rest of the thread. If you still don’t get it I cannot help you.
  
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  - SmartmanApps@programming.dev ⁨18⁩ ⁨hours⁩ ago
    
    I am not going to argue with you about it
    
    Nor should you. I’m a Maths teacher.
    
    This was resolved almost a month ago
    
    And yet you still don’t understand what’s wrong with what you said.
    
    Read the original equation again, plug some numbers into it, and try again.
    
    That’s what you need to do. You’re the one coming up with wrong answers when you change the order. Changing the order doesn’t change the answer.
    
    If you still don’t get it I cannot help you
    
    It’s not me who doesn’t get it. I teach it.
    
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    Arkouda@lemmy.ca ⁨14⁩ ⁨hours⁩ ago
    I feel bad for your students if you cannot see why you are wrong here.
    
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