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  #1  
Old 02-12-2013, 01:28 PM
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help me with this algebra please.

i'm stumped. help me find X

A=B(1+X)^n

I've been trying to figure it out for the past hour. It is basically the time value of money equation. the unknown is the rate (X)
A=new value
B=old value
n=# of periods

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  #2  
Old 02-12-2013, 01:34 PM
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Dear Algebra,

I don't know where your X is, nor do I care Y they haven't come back.

Yours truly,

Me
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  #3  
Old 02-12-2013, 01:35 PM
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Quote:
Originally Posted by jplinville View Post
Dear Algebra,

I don't know where your X is, nor do I care Y they haven't come back.

Yours truly,

Me
man, that is profound!
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  #4  
Old 02-12-2013, 01:38 PM
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can you do

take the nth root of (a/b) -1 = x

??

its been a while for me too.
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  #5  
Old 02-12-2013, 01:39 PM
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Quote:
Originally Posted by benhogan View Post
man, that is profound!
LOL

This would be a problem I'd have my daughter look at later tonight to see if it makes sense to her. She's in advanced Algebra II at her high school.

I'll let you know what she comes up with...
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  #6  
Old 02-12-2013, 01:43 PM
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Quote:
Originally Posted by TheDon View Post
can you do

take the nth root of (a/b) -1 = x

??

its been a while for me too.
no. i tried that. i suspect that both sides have to be raised to the "e". just not sure.
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  #7  
Old 02-12-2013, 01:49 PM
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Quote:
Originally Posted by TheDon View Post
can you do

take the nth root of (a/b) -1 = x

??

its been a while for me too.
That's what I got also.
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  #8  
Old 02-12-2013, 01:54 PM
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That's what I got also.
that's gotta be it. i just could not use the calculator properly. thanks guys. you rock
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  #9  
Old 02-12-2013, 02:04 PM
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Quote:
Originally Posted by benhogan View Post
that's gotta be it. i just could not use the calculator properly. thanks guys. you rock

nope. it will take an algebra genius to get this right.

if A=121, B=100, n=2 then X=10%

i can use a HP 12c financial calculator but I can't figure out the algebra part
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  #10  
Old 02-12-2013, 03:37 PM
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Quote:
Originally Posted by benhogan View Post
nope. it will take an algebra genius to get this right.

if A=121, B=100, n=2 then X=10%

i can use a HP 12c financial calculator but I can't figure out the algebra part
If you plug those numbers into the equation TheDon offered, doesn't it work for you? It does for me.
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  #11  
Old 02-12-2013, 04:14 PM
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Quote:
Originally Posted by benhogan View Post
nope. it will take an algebra genius to get this right.

if A=121, B=100, n=2 then X=10%

i can use a HP 12c financial calculator but I can't figure out the algebra part

Most TI calculators you can enter direct and it scrambles the eggs for you and pops out the answer.
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  #12  
Old 02-12-2013, 04:24 PM
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Just quickly, since I hate these problems.

EDIT: nevermind, I got it... x=(a/b)^(1/n)-1
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  #13  
Old 02-12-2013, 04:32 PM
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Quote:
Originally Posted by martureo View Post
Just quickly, since I hate these problems.

EDIT: nevermind, I got it... x=(a/b)^(1/n)-1

pure genius. that is it!!!!

please show me how you did it.
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  #14  
Old 02-12-2013, 04:39 PM
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If you have Excel on your computer, you can simply type any formula you want into the cells and then plug values in and it will do the calculations for you.
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  #15  
Old 02-12-2013, 05:44 PM
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Quote:
Originally Posted by benhogan View Post
nope. it will take an algebra genius to get this right.

if A=121, B=100, n=2 then X=10%

i can use a HP 12c financial calculator but I can't figure out the algebra part
fyi, there is now an iphone app for the HP12c. It's about 3 bucks my partner told me. He uses it all the time
(I still use the 19B "booklet" It works!)

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