raising a number to a negative power is the same as taking the recipricol of that number.
so X^-1 = 1/x
so this becomes 1/A + 1/B = 1/A+B
thats surprising coming from you, eschn3am ! ill just assume it was a typo !
haha, I was watching a movie when I responded to this and knew the math behind it but just tailored my answer to the one he chose (as opposed to the correct answer up there). Oop! my mistake!!