48÷2(9+3) = ????

[potentialeight]

The TI-85 has a parsing error that will cause this, you can get an update for it though.

 

[adammcd]

Was already posted:

"The general consensus among math people is that "multiplication by juxtaposition" (that is, multiplying by just putting things next to each other, rather than using the "×" sign) indicates that the juxtaposed values must be multiplied together before processing other operations"

To translate it - second brackets may be implied by the person who wrote this equation.
Thats why the confusion.

I've never heard nor was taught that 2(x) takes precedence over other multiplcation/division strings in an equation. 2(x) and 2 * (X) are the same thing (with the former, you're just not writing the dot when you multiply a number by a bracketed equation/number).

 

[crackp0t]

Was already posted:

"The general consensus among math people is that "multiplication by juxtaposition" (that is, multiplying by just putting things next to each other, rather than using the "×" sign) indicates that the juxtaposed values must be multiplied together before processing other operations"

To translate it - second brackets may be implied by the person who wrote this equation.
Thats why the confusion.

Could you please cite a source that talks about implied brackets? I've never heard of brackets being implied nor can I find anything mentioning them.

 

[super]

Could you please cite a source that talks about implied brackets? I've never heard of brackets being implied nor can I find anything mentioning them.

For instance here:

The Order of Operations: More Examples (second paragraph from the bottom)

 

[papajohn56]

Just curious - is it genuine photo 100%?

That's real. The TI-85 was known to be buggy, and the 86 was released to rectify most of it as well as offer some minor upgrades.

 

[jdub722]

crackp0t - it's the fuckin' Indians brother....dot, not feather.

 

[-joe-]

Sad

In Canadian Public School I was taught that it was BEDMAS

foreveralone.jpeg

What did the E stand for?

BIDMAS here. (indices)

 

[mGrunin]

2.




Troll.

 

[cardine]

What did the E stand for?

BIDMAS here. (indices)

exponents

 

[atinmich]

Ditto 2

 

[LTJeremy]

Thanks for this source of contention in our office today. Getting heated

 

[TeeBird]

This is probably the best thread I have read in a while. Proof that we are all geeks.

 

[nickster]

Also,

<?php
echo 48/2*(9+3);
?>

php says 288, javascript confirms:

<script type="text/javascript">
alert(48/2*(9+3));
</script>

This is where the confusion arises.

You are writing the equation in the problem incorrectly. It is not 48/2*(9+3) it is 48/2(9+3)

The fact that the 2 is right next to the brackets means that if the juxtaposition rule applies (or exists) then the 2 would need to be multiplied by the (9+3) BEFORE the division happens. This is the problem that everyone is having in understanding that the answer is not as simple as it first may seem.

I actually believe that the juxtaposition rule must exist as if you look at the following it would make no sense if it did not

10x/5x

According to the juxtaposition rule the answer would be 2

but if you ignore it then the equation should read

10*x/5*x

and if you work that out left to right then
it equates to 2x^2 which isn't right.

 

[CygnusX]

a bit offtopic. Is that you in your avatar pic?

Yes, that's me. My name is Monika Vesela and you can sign up to my paysite here if you want to see more

fftopic:

 

[dooogen]

lol. Those saying 2 are being thrown off by the ÷ symbol.

Look at it like this:

48/2 * (9+3)

That's the same as [48(9+3)]/2 = 288

I cant believe this has 3 pages of arguing.

 

[csnreyes]

Where are the brackets????

() is parentheses
[] that is brackets
a number or variable by () (e.g. x(a+1) is the same as x * (a+1)

 

[blank_czech]

This is why a lot of people shy away from/hate math. Have to pay attention.

 

[crackp0t]

Where are the brackets????

() is parentheses
[] that is brackets
a number or variable by () (e.g. x(a+1) is the same as x * (a+1)

They're apparently implied (invisible)...

 

[zxcvb]

Here is the answer for those of you who have the patience to read:

Math Forum - Ask Dr. Math

 

[zxcvb]

Math Forum - Ask Dr. Math

"Calculators have somewhat different needs than mathematicians, since they have to take input linearly, one character after another, so they are forced to
make a decision about it. On the TI Web site I learned that they
deliberately put this "feature" into the TI 82, and then took it out
of the TI 83, probably because they decided it was not a standard rule
and would confuse people. Take a look at their explanation:"