Re: HELP!!

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Re: HELP!!

My math teacher thinks it is implied multiplication, and when we let
the calculator do it (it was a longer problem) 75 percent of the class
got it wrong. So now I make sure I put paren around my so called
*implied* groupings.

On Thu, 24 Sep 1998 22:17:13 -0400, Ray Kremer <raykremer@HOTMAIL.COM>
wrote:

>I think if you write 10/2x on paper, it is obvious that you mean 10 over 2x,
>otherwise you would write 10x/2 or (10/2)x.  The 82 and 85 did it this way.
>For whatever reason, TI then changed it and made it strictly left to right,
>even so-called implied multiplication.  I think it was better the 82/85 way,
>but as long as you can remember on the 83 and 86 that 2x means 2*x, you're
>fine.
>
>>I am a high school teacher at Northern HS in MD.  Our faculty has been
>>recently debating an issue that up until yesterday seemed quite simple.
>>We would like your help in resolving the issue.
>>
>>The problem:  Evaluate   10/2x when x=4.
>>
>>Some of our faculty seems to think that 2x is like an understood group.
>>Therefore, 10/8=1.25.  According to Texas Instruments this is called
>>"implied multiplication."  Where the 2x is an implied group.
>>
>>On the other hand, according to the order of operations, mult and div go
>>
>>left to right, so 5*4=20.  According to TI, this is called "explicit
>>multiplication"
>>
>>For TI's definition of "Implicit vs. Explicit"  go to:
>>http://www.ti.com/calc/docs/faq/83faq039.htm
>>
>>Some of the Texas Instruments graphing calculators
>>contradict themselves.  The TI-81 treats 2x as a group, whereas the
>>TI-83 does not.
>>
>>Any thoughts that you have on the subject would be appreciated
>>
>>Thanks,
>>Eric Stroh
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