# Math Help - help with transposition

1. ## help with transposition

Hi.
I have a tricky formula transposition. Can anyone confirm my result for me.
Equation is:-

B = (F R C/A e r) + (F/A)

Please make F the subject.

My result gives
F = B/(R C/ A e r) - (1/A)

Problem is that by using this transformation, my result is not correct.

Please can anyone help???

2. I take it that you mean
$B= \frac{FRC}{Aer}+ \frac{F}{A}$

$B= \left(\frac{RC}{Aer}+ \frac{1}{A}\right)F= \left(\frac{RC+ er}{Aer}\right)F$

$F= \frac{Aer}{RC+ er}B= \frac{ABer}{RC+ er}$

3. Thanks so much. Transposition is not by best subject.