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-   -   help me with this algebra please. (http://www.peachparts.com/shopforum/off-topic-discussion/334577-help-me-algebra-please.html)

benhogan 02-12-2013 01:28 PM
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

jplinville 02-12-2013 01:34 PM
Dear Algebra,

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

Yours truly,

Me

benhogan 02-12-2013 01:35 PM
Quote:
Originally Posted by jplinville (Post 3098784)
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! :D

TheDon 02-12-2013 01:38 PM
can you do

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

??

its been a while for me too.

jplinville 02-12-2013 01:39 PM
Quote:
Originally Posted by benhogan (Post 3098786)
man, that is profound! :D
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...

benhogan 02-12-2013 01:43 PM
Quote:
Originally Posted by TheDon (Post 3098787)
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.

cmac2012 02-12-2013 01:49 PM
Quote:
Originally Posted by TheDon (Post 3098787)
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.

benhogan 02-12-2013 01:54 PM
Quote:
Originally Posted by cmac2012 (Post 3098793)
That's what I got also.
that's gotta be it. i just could not use the calculator properly. thanks guys. you rock

benhogan 02-12-2013 02:04 PM
Quote:
Originally Posted by benhogan (Post 3098796)
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

Eskimo 02-12-2013 03:37 PM
Quote:
Originally Posted by benhogan (Post 3098801)
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.

Dudesky 02-12-2013 04:14 PM
Quote:
Originally Posted by benhogan (Post 3098801)
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.

martureo 02-12-2013 04:24 PM
Just quickly, since I hate these problems.

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

benhogan 02-12-2013 04:32 PM
Quote:
Originally Posted by martureo (Post 3098863)
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.

KarTek 02-12-2013 04:39 PM
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.

dynalow 02-12-2013 05:44 PM
Quote:
Originally Posted by benhogan (Post 3098801)
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!:cool:)


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