Subject

Then my last one for the day...

Make L the subject

$Z= {\sqrt{R^2+W^2L^2}}$

I did this:

$R^2+W^2L^2=Z^2$

$W^2L^2=Z^2-R^2$

$L^2={Z^2-R^2 \over W^2}$

$L= \sqrt{{Z^2-R^2} \over W^2}$

mmmmmm...I'm not so sure!!..