Adding and Subtracting Polynomials

SlowlyFading · 2012-08-15 11:12:20

17) should be

Except there should be a minus sign between the two 2's..

18) should be

19) should be

noelevans · 2012-08-15 12:23:46

Hi SlowlyFading!

Hey, you are using LaTex! That's fantastic. Takes a little bit of getting used to but it's worth it.

17) What are (5-6) and (-2+2)? And notice that the x term is just -3x. Nothing combines with it.
Looking at the LaTex for your answer to 17) I can't figure out why the 2x^2 and 2x got stuck
together.

18) Check!, OK, Correct, Right, Correctomundo!

19) Looking at the LaTex I can't figure out why the extra x got stuck to the 4x^2 term.
Anyway without that extra x (should be a space where the x is) the answer looks good:

Notice that the \; causes the spaces in the LaTex output. The more you put, the wider the space.

Help bobbym! Can you help us figure out what the problem is with the LaTex?

bobbym · 2012-08-15 12:34:38

Hi;

2x^2 2x

On 17 he has a . instead of a plus or a minus. Latex can not interpret it.

4x^2 x

Same problem on 19.

phrontister · 2012-08-15 12:47:20

Hi Bobby and noelevans,

My browser's not displaying the dot in SlowlyFading's post.

I think the problem is that the apparent minus sign is actually an 'em dash', which MIF's LaTeX can't interpret (but Codecogs displays it as if it were a minus sign).

When composing in M$ Word, a minus sign is automatically replaced by an em dash after typing a space followed by a minus sign followed by a space and some other entry. So I wonder if SlowlyFading's composition was in a word processor, not a LaTeX editor. That problem doesn't arise when typing directly into MIF's message box.

With the em dash in I get:

#17:

#19:

Using a minus sign instead of the em dash gives:

#17:

#19:

Composing in M$ Word without using a space on both sides of the minus sign displays correctly.

Also, when typing directly into MIF's message box the display is the same with and without spaces before and after the plus and minus signs.

Last edited by phrontister (2012-08-15 13:51:34)

bobbym · 2012-08-15 14:11:56

Hi phrontister;

You might be right. That is the reason I type directly into codecogs. Saves a lot of problems. Even using latex from M can be a problem.

phrontister · 2012-08-15 14:16:53

Hi Bobby,

If you click on SlowlyFading's #19 you'll see the different dash lengths between "2 - x" and "x - 4". #17 doesn't have that comparison, but you can see the dash is longer than usual...like in #19's "2 - x".

Last edited by phrontister (2012-08-15 14:18:05)

bobbym · 2012-08-15 14:24:34

Hi phrontister;

I can edit the length of those dashes to be equal but how will that get rid of that "."?

phrontister · 2012-08-15 14:52:26

I can't see that "." even though I've wiped my specs ten times already! .

Where exactly is it?

noelevans · 2012-08-15 15:33:46

Thanks all of you!

I can't see the "." in the original post, but I can see the difference in the lengths of the dashes, the
minus vs the m dash. I do my encoding with "Post reply" on MIF so I guess that's why I haven't nad
any problems with it.

Thanks again!

SlowlyFading, did you see the difference in the two dashes?

bobbym · 2012-08-15 22:13:00

Hi phrontister;

Could be that is how my browser's font interprets that character.

His post #26 when I click on his latex

x4 + 4x^3 + 2x^2 2x

there is that darn dot.

Bob · 2012-08-15 22:18:49

hi bobbym,

That'll be it. I see no dot with IE9.

I've long known about the minus sign problem.

If I take someone's text version of a question and paste it back in [latex] brackets the minuses don't show.

But if I retype them they do. I can set it up on my keyboard too. Make a text minus, copy it into Latex and it vanishes. Type it inside the square brackets and there it is. Weird.

His latex: -4x^3 + 4x^2 x - 4

Now re-minused:

Bob

bobbym · 2012-08-15 22:26:42

Hi;

Got it. There is the dot!

Bob · 2012-08-15 22:29:09

Excel says the ASCII for a long minus is 150 and a short is 45.

When I type one on my keyboard it is a 45, but when it is rendered into Latex it becomes a 150.

Try a character for 150 and 45 on your computer and see what it shows.

B

phrontister · 2012-08-15 22:40:17

Hi Bobby,

Got it. There is the dot!

I always believed that you saw it, but not necessarily that it was there!

I'd thought that maybe there was a fly-spot on your screen, or that you wore binocular specs and had them on back-to-front!

bobbym · 2012-08-15 22:45:26

Hi Bob;

I get a û when I enter alt 150. On mine this does not render in latex at all. Did you mean alt 95?

Hi phrontister;

I'd thought that maybe there was a fly-spot on your screen, or that you wore binocular specs and had them on back-to-front!

I killed those flies about a month ago. Yes, I got both of them. The question is, to dot or not to dot. Post #37 shows an actual, in living color snapshot of my screen. The dot according to my computer is a real phenomena and not an apparition.

I always believed that you saw it, but not necessarily that it was there!

It is true that my dopamine and/or serotonin levels have been dropping over the last few months but why would that make my computer see dots?

phrontister · 2012-08-16 00:01:38

bobbym wrote:

...but why would that make my computer see dots?

Maybe its stress levels are up?

anonimnystefy · 2012-08-16 00:06:14

Hi bobbym

the alt+150 isn't necessarily the same character as the ASCII 150 character.

bobbym · 2012-08-16 01:48:47

Maybe its stress levels are up?

I did not think of that. I will have it hum a pleasant tune while displaying an aquarium screensaver. That should calm it down.

anonimnystefy · 2012-08-16 01:52:26

No, that is what would cqlm you down. I think it needs a circuit masaage.

bobbym · 2012-08-16 02:01:25

Hi;

http://www.keepandshare.com/doc/947949/ … on-windows

This here page says I am entering the ascii characters correctly.

anonimnystefy · 2012-08-16 02:21:07

Did you try the first 31?

Either way, searching through the table, I found that the short and the long dash are 45 and 196 respectively.

Last edited by anonimnystefy (2012-08-16 02:23:12)

bobbym · 2012-08-16 02:23:20

For those this table is different than the special character table but after that they seem the same.

anonimnystefy · 2012-08-16 02:25:50

Hi bobbym

Did you see the edit?

bobbym · 2012-08-16 02:30:04

I sure did. Now what?

anonimnystefy · 2012-08-16 02:31:45

Just asking. Did you see my suggestion of a circuit massage for your computer?

Math Is Fun Forum

#26 2012-08-15 11:12:20

Re: Adding and Subtracting Polynomials

#27 2012-08-15 12:23:46

Re: Adding and Subtracting Polynomials

#28 2012-08-15 12:34:38

Re: Adding and Subtracting Polynomials

#29 2012-08-15 12:47:20

Re: Adding and Subtracting Polynomials

#30 2012-08-15 14:11:56

Re: Adding and Subtracting Polynomials

#31 2012-08-15 14:16:53

Re: Adding and Subtracting Polynomials

#32 2012-08-15 14:24:34

Re: Adding and Subtracting Polynomials

#33 2012-08-15 14:52:26

Re: Adding and Subtracting Polynomials

#34 2012-08-15 15:33:46

Re: Adding and Subtracting Polynomials

#35 2012-08-15 22:13:00

Re: Adding and Subtracting Polynomials

#36 2012-08-15 22:18:49

Re: Adding and Subtracting Polynomials

#37 2012-08-15 22:26:42

Re: Adding and Subtracting Polynomials

#38 2012-08-15 22:29:09

Re: Adding and Subtracting Polynomials

#39 2012-08-15 22:40:17

Re: Adding and Subtracting Polynomials

#40 2012-08-15 22:45:26

Re: Adding and Subtracting Polynomials

#41 2012-08-16 00:01:38

Re: Adding and Subtracting Polynomials

#42 2012-08-16 00:06:14

Re: Adding and Subtracting Polynomials

#43 2012-08-16 01:48:47

Re: Adding and Subtracting Polynomials

#44 2012-08-16 01:52:26

Re: Adding and Subtracting Polynomials

#45 2012-08-16 02:01:25

Re: Adding and Subtracting Polynomials

#46 2012-08-16 02:21:07

Re: Adding and Subtracting Polynomials

#47 2012-08-16 02:23:20

Re: Adding and Subtracting Polynomials

#48 2012-08-16 02:25:50

Re: Adding and Subtracting Polynomials

#49 2012-08-16 02:30:04

Re: Adding and Subtracting Polynomials

#50 2012-08-16 02:31:45

Re: Adding and Subtracting Polynomials

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