# help to clear a complex formula

• Oct 4th 2012, 02:39 PM
gevargu
help to clear a complex formula
Attachment 25047 how will look that equation if p = 0 and i want to clear I.... I have tried everything i know, but nothing has worked so if anybody can help me with that.... if also anybody knows about a function in R capable to do that will be awesome
• Oct 4th 2012, 03:08 PM
MathoMan
Re: help to clear a complex formula
set p to zero, get rid of the denominator, move to the left all but the square root, then square the entire equation, after that square the expression in brackets and then some things should cancel out, other things can be added together. Ensure that all expressions containing I are on the left and all the others on the right, then on the left extract I and after that finally divide by the factor you get within brackets after extracting I. Easy as Pi. ;)
• Oct 4th 2012, 03:46 PM
MaxJasper
Re: help to clear a complex formula
$\displaystyle I = \frac{\left(P-R_d\right) \left(P \Theta -A_{\max }-\Theta R_d\right)}{\phi \left(P-A_{\max }-R_d\right)}$

$\displaystyle A_{\max }= \frac{\left(P-R_d\right) \left(P \Theta -I \phi -\Theta R_d\right)}{P-I \phi -R_d}$