if-x-a-1-r-n-1-r-make-r-the-subject-of-the-formulae-

Question Number 8421 by uchechukwu okorie favour last updated on 24/Oct/16

$${if}\:{x}=\frac{{a}\left(\mathrm{1}−{r}^{{n}} \right)}{\mathrm{1}−{r}};\:{make}\:{r}\:{the}\: \\ $$$${subject}\:{of}\:{the}\:{formulae} \\ $$

Commented by FilupSmith last updated on 11/Oct/16

$${x}−{xr}={a}−{ar}^{{n}} \\ $$$${x}−{a}={xr}−{ar}^{{n}} \\ $$$${working} \\ $$