Question

Simplify?

Answer 1

One sec... my math input isn't working

Answer 2

See attached... for some reason I can't input math where I am.

Answer 3

Hmmm, that attachment has no explanation on it.
All I can see are:
I got _______________________________________
Instructor got _____________________________________

By the way, I believe the OpenStudy Draw and Equations functions have not been working for a few days now.

Answer 4

I can see the attached fine

Answer 5

The file used microsoft word equation editor 3.0 for math input.

Answer 6

Should be native to MS Word

Answer 7

I'm not sure, I'm sorry.

Answer 8

Let's try this. See attached.

Answer 9

That is an absolute value. So dividing an absolute value with the same number would give you a negative answer, which would correct for the absolute value you missed in the simplification you had.

Answer 10

I just tried opening it with OpenOffice write and Open Office calc - even Notepad and it doesn't show up.

Answer 11

Okay, the png graphic works.

Answer 12

@Mathbreaker - I'm not sure how that gives what the instructor shows for his final answer.

Answer 13

@wolf1728 - are you using this for OpenOffice?
http://www.openoffice.org/product/math.html

Answer 14

See, you have +/- 1 right? similarly, if the x is negative, it would give you a negative answer as the x would get cancelled, but the sign would remain unchanged, but if it is positive, there would be no difference :)

Answer 15

@wolf1728 - also, the equation editor that is native to MS Word is a lite version of an application named MathType. I'm curious to know if you would be able to view that document if you install MathType on your computer. Likewise, if you create an OpenOffice document with equations built in MathType, would I be able to view it in Word.

Answer 16

Right - I see that and that's a much different concept from my answer with the +/- 1. But I'm curious how he derived that from the equation in the first line. I'll post another document that shows my thought process each step of the way. One sec!

Answer 17

Let's do this a little at a time. Right so far? (see attached)

Answer 18

I rewrote the graphic (now it has been redrawn by 8toenails

Answer 19

The two terms are products... not differences. Other than that, everything is right.

Answer 20

Sorry, the two fractions.

Answer 21

Yes I was wondering if that was a dot • or a negative -
Anyway, I thought making the graphic larger than the original would help.

Answer 22

That's it!

Answer 23

You mean I drew it correctly?
Or did I actually find an answer???

Answer 24

lol... drew it correctly.

Answer 25

FYI... here's the answer on W|A... it differs from both of us!

http://www.wolframalpha.com/input/?i=simplify+ [1%2F%28sqrt%28x^2%29*abs%28sqrt%28x^2%2B1%29%29%29]*[x%2Fsqrt%28x^2%2B1%29]

Answer 26

This input method sucks. It broke up the URL above.

Answer 27

\[
\text {If } \\
x \in R ,\\ \text{ then }\\
\sqrt{x^2+1} >0\\
\left | \sqrt{x^2+1} \right|=\sqrt{x^2+1}\\
\sqrt{x^2+1}\left | \sqrt{x^2+1} \right|=\sqrt{x^2+1} \sqrt{x^2+1} = x^2 +1\\

\sqrt{x^2} =|x|
\]
Replace and you get the answer.

Answer 28

Thanks! Is there a web based app I can paste all of that into to see it plainly?

Answer 29

Got it!
http://www.sciweavers.org/free-online-latex-equation-editor

Answer 30

http://www.codecogs.com/latex/eqneditor.php

Answer 31

Why are we saying \sqrt{x^2+1} >0 instead of it being +/ ?

Answer 32

x^2 +1 >= 1 > 0

Answer 33

oh!

Answer 34

So the same logic holds true for \sqrt{x^2} =|x| \]

Answer 35

If |x| > 0 then can't we simplify the instructor's answer to just 1/(x^2+1) ? I feel like it can be simplified that way but he is showing me the answer in his form to make me think about it.

Answer 36

so the final answer would be the same as mine but without the +/-

Answer 37

If x >0, |x|=x
if x<0 , |x|=-x

Answer 38

oh, I see what you're saying. That would make it different from my answer.

Answer 39

You cannot sya +/- for every x.
It is + for x >0
and - for x <0

Answer 40

say

Answer 41

I gotcha. I'm in a Calc II course and the algebra is what's kicking my butt!

Answer 42

Thank you for your time!

Answer 43

Use my site http://saab.org to practice calculus problems

Answer 44

I'll take a look! Thanks!

Answer 45

Especially
http://www.saab.org/calculus.cgi

Answer 46

YW

Answer 47

bookmarked! Thanks again!