Mathamania discussion
Math Help
message 1:
by
[deleted user]
(new)
Jan 24, 2009 01:59PM
Help me, all you geometry dorks! I want to make A+ averages, too!
reply
|
flag
Mod
Mod
3^2x
-----
3^2x-1
=???????
simplify. this was on my homework.
-----
3^2x-1
=???????
simplify. this was on my homework.
Mod
it's supposed to be three, but i have no idea how to do it.
X(
X(
Mod
yeah. i don't know how they did that. this is so confusing. i got
1
--
9
1
--
9
Mod
yay! this is a TAKS thingie. blech!!!!!!!!!!
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?
Mod
Oh, okay, thanks! I think I get it now.
Mod
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?
so..if we hhave to simplify it, how do we get 3???Wait.. Iam confused..
Me too. High fives for confusion!!! =D
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....
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
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
Oh, okay. So the x is there just to confuse you and it doesn't really mean anything. Hmmm...interesting.
Mod
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?
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
Mod
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.
Mod
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.
how the heck do you do a parabola? y=(###)(###)??? this is confusing. please explain.
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?
Mod
oh.......like james? jasmine wants to shoot him. good luck.
Mod
Thanks for telling you jasmine wants to shoot james? or good luck? the good luck is for both geometry and jasmine.
Mod
