Mathamania discussion

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Math Help

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message 1: by [deleted user] (new)

Help me, all you geometry dorks! I want to make A+ averages, too!


message 2: by Victor (new)

Victor (damoclesword) | 6 comments Lolz, ok, need help with what?


message 3: by [deleted user] (new)

everything.



message 4: by Victor (new)

Victor (damoclesword) | 6 comments like...


message 5: by Joon, Math genius (last edited Jan 24, 2009 02:09PM) (new)

Joon (JoonChang) | 67 comments Mod
Could you be more specific? Are you talking about the real Geometry like: Prove that tirangle ABC is congruent to triangle DEF when AB is congruent to DE and that angle D is congruent to angle A? Or just regular geometry that we learned in elementry like: Find the area of the square when one side is 134?


message 6: by Victor (new)

Victor (damoclesword) | 6 comments Exactly


message 7: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
Thank you. So which one is it Sarah?


message 8: by [deleted user] (new)

3^2x
-----
3^2x-1

=???????
simplify. this was on my homework.


message 9: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
Hmm. I answered this, but I wasn't sure. Was it 2x^2


message 10: by [deleted user] (new)

it's supposed to be three, but i have no idea how to do it.
X(


message 11: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
Oh yeah. That's what the answer key said.


message 12: by [deleted user] (new)

yeah. i don't know how they did that. this is so confusing. i got
1
--
9


message 13: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
That was confusing.


message 14: by [deleted user] (new)

yeah, i know. *sigh....


message 15: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
If someone could help describe how it is three, then I will be very grateful.


message 16: by Jin (new)

Jin | 22 comments I will try to solve it


message 17: by [deleted user] (new)

yay! this is a TAKS thingie. blech!!!!!!!!!!


message 18: by Elaine (last edited Jan 25, 2009 11:51AM) (new)

Elaine (caladhiel) First, I need to clarify what the problem is exactly. Is it (3^2)x-1 or (3^2x)-1 or what? Are we solving for x?


message 19: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
We are just simplifying it.


message 20: by Elaine (new)

Elaine (caladhiel) Oh, okay, thanks! I think I get it now.


message 21: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
Your welcome. So, does anyone know yet?


message 22: by Elaine (last edited Jan 25, 2009 12:07PM) (new)

Elaine (caladhiel) No. Could you write it down again, just so that I can make sure I understand what the exact equation is? And is the answer suppose to be just 3?


message 23: by Jin (new)

Jin | 22 comments so..if we hhave to simplify it, how do we get 3???
Wait.. Iam confused..


message 24: by Elaine (last edited Jan 25, 2009 03:15PM) (new)

Elaine (caladhiel) Me too. High fives for confusion!!! =D


message 25: by Jin (new)

Jin | 22 comments What is a question again??
Is it 3^2x or 3^2x-1???or is it 3^2x/3^2x-1?????
I cannot solve it until I get the real problem....


message 26: by Victor (new)

Victor (damoclesword) | 6 comments 9x^2 i think


message 27: by Elaine (new)

Elaine (caladhiel) What?! I'm confused!


message 28: by [deleted user] (new)

sorry. oh! i get it.
see, the exponent is x. double that, it's the same on the bottom, so it doesn't really matter. on the bottom, you subract one exponent value
so, for example,
3^2x
----
3^2x-1. pretend that the x is one. then you multiply it by two. so, 3^2=9. but, two minus one is one, so it equals
3^2
----
3^1. that's 9/3 which is three
YAY I FINALLY UNDERSTAND


message 29: by Jin (new)

Jin | 22 comments ok.......


message 30: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
Very good.


message 31: by Elaine (new)

Elaine (caladhiel) Oh, okay. So the x is there just to confuse you and it doesn't really mean anything. Hmmm...interesting.


message 32: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
Actually, the x is a major thing in the problem. Everything in a problem is important.


message 33: by Elaine (last edited Jan 27, 2009 05:53PM) (new)

Elaine (caladhiel) But, (I'm not contradicting you, I trust that you're right, I just want to understand), you would get the same answer if the question was:

3^2/3^2-1

right?


message 34: by Priya (new)

Priya | 9 comments 3^(2x)/3^(2x-1) is the same as 3^(2x-2x+1), which is 3^1, or 3... gee yall are slow and really behind..XD


message 35: by Victor (new)

Victor (damoclesword) | 6 comments lolz,Idk


message 36: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
Not very nice of you Priya. Some people take longer to understand.


message 37: by Elaine (last edited Jan 28, 2009 02:18PM) (new)

Elaine (caladhiel) Yep, we're all here because we love math and want to have fun with it. Whether it's 2+2=4 or x = {-b (+-) (the square root of b^2 - 4ac)} / 2a.


message 38: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
Too bad I can't wirte the quadratic formula. I just memorized the whole thing. Guess what this formula is: ax^2 + bx + c =0 (I think this is correct.)


message 39: by Elaine (last edited Jan 29, 2009 10:34AM) (new)

Elaine (caladhiel) I know, the quadratic formula is really cool! That's what I attempted to write up there *point to post 37*, but it didn't work so good because of the square root and the plus/minus. Oh, well. I'm not sure what the exact name of your formula (ax^2+bx+c=o) is, but you use it when solving by factoring.


message 40: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
Yes. It is a parabola.


message 41: by [deleted user] (new)

how the heck do you do a parabola? y=(###)(###)??? this is confusing. please explain.


message 42: by Elaine (last edited Jan 30, 2009 05:52PM) (new)

Elaine (caladhiel) Well, let's just say that this is our problem:

-x+x^2 = 12

you can rearrange the problem so that it is now:

x^2 - x - 12 = 0

we can then factor:

(x-4)(x+3) = 0

and finish:

x = 4, -3

Does that make sense?


message 43: by [deleted user] (new)

oh.......kindof.
=O


message 44: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
We are going to learn parabolas soon. I learned it last Monday. I'm trying to get finished with algebra as fast as I can so I can go to geometry.


message 45: by [deleted user] (new)

oh.......like james? jasmine wants to shoot him. good luck.


message 46: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
Thanks. Can't wait till I finish.


message 47: by [deleted user] (new)

Thanks for telling you jasmine wants to shoot james? or good luck? the good luck is for both geometry and jasmine.


message 48: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
Sure, I guess both.


message 49: by [deleted user] (new)

lolz


message 50: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
I just hope I won't fail geometry next year.


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