Originally Posted by

**Robert12** Hi, I have two (basic) questions that I cant seem to understand. I'm in a self taught course where I learn everything from a book so it might have not explained everything fully. Question #1. $\displaystyle p = 2hw/(s+1)$ solve s. My answer to the question is $\displaystyle \color{blue} s = -1 + 2hw/p$ however I've been told the correct answer is $\displaystyle \color{red}s = -p + 2hw/p$. My question is, why are there two P's now instead of 1? Can anyone explain that to me? Thank you.