Equation help - LCD with variables

Oct 2012
2
0
MI
Hi there,

Many thanks in advance for the help.

Here is the equation I am struggling to solve:



110 = 1/(1+r) x 32.1/r


How I solve for "r", or perhaps find an LCD with these denominators?


Thanks so much,
Naldo
 

skeeter

MHF Helper
Jun 2008
16,217
6,765
North Texas
110 = 1/(1+r) x 32.1/r
assuming the "x" meant multiplication ...

\(\displaystyle 110 = \frac{32.1}{r(r+1)}\)

\(\displaystyle r(r+1) = \frac{32.1}{110}\)

\(\displaystyle r^2 + r - \frac{32.1}{110} = 0\)

recommend using the quadratic formula ...
 
Oct 2012
2
0
MI
Thank you so much for the help!

Best!