Techtech

Thu Aug 1, 2019, 10:42 AM

82(2+2) ?

Here's an explanation.

https://www.foxnews.com/tech/viral-math-problem-baffles-many-internet

Edit to add. The ? is a division symbol.



5 replies, 242 views

Reply to this thread

Back to top Alert abuse

Always highlight: 10 newest replies | Replies posted after I mark a forum
Replies to this discussion thread
Arrow 5 replies Author Time Post
Reply 82(2+2) ? (Original post)
def_con5 Aug 2019 OP
Cold Warrior Aug 2019 #1
fools_gold Aug 2019 #2
Cold Warrior Aug 2019 #3
fools_gold Aug 2019 #4
rampartb Aug 2019 #5

Response to def_con5 (Original post)

Thu Aug 1, 2019, 11:46 AM

1. Say what?

First the guy explaining the PEDMAS method changes 2+2 to 2X2. Yes these are the same but what mathematician would do that? Then he says...

8÷2(2x2) = 8÷2(4) = 8÷8 = 1 = Answer is 1

2 raised to the fourth is 16, not 8. WTF are these people talking about???

Reply to this post

Back to top Alert abuse Link here Permalink


Response to Cold Warrior (Reply #1)

Thu Aug 1, 2019, 12:20 PM

2. Where do you see am exponential?

I see no 2 raised to the fourth power.

Reply to this post

Back to top Alert abuse Link here Permalink


Response to fools_gold (Reply #2)

Thu Aug 1, 2019, 12:23 PM

3. 2(2+2)

How would you interpret that?

Reply to this post

Back to top Alert abuse Link here Permalink


Response to Cold Warrior (Reply #3)

Thu Aug 1, 2019, 12:34 PM

4. two times the separate operation of two plus two, or 8.

In my 50+ years of engineering mathematical notations, before we had easily available subscripts and superscripts, we would use the ^ "carot" figure, or sometimes (e) or (*), such as

2^(2+2) or

2(*)(2+2) or

2 (e) (2+2)

A number abutted right up to another operation is always a straight multiplication.

That's the way we have always done it.

Reply to this post

Back to top Alert abuse Link here Permalink


Response to Cold Warrior (Reply #3)

Thu Aug 1, 2019, 01:05 PM

5. distributive property

add the internal 2s then multiply by 2.

I know that the parentheses is in the denominator and i'm sure that any machine running fortran or basic would solve this :

8 / 2(2+2) = 8 / 2(4) = 8/ 8 = 1

but I can't put my finger on a rule. pedmas does indeed return a 16, but I think that might require an explicit * rather than that distributive property.

Reply to this post

Back to top Alert abuse Link here Permalink

Techtech