I was going through an algebra book to brush up in anticipation of possibly going back to school (although I took Calculus in high school, it's been 18 years...). In an end-of-chapter quiz I came up with a solution to a problem as:
- -1 (A over P minus one)
But the the answer key for the quiz gave the answer as:
--- (A minus P over P)
Near as I can tell, those are equivalent. Am I right or wrong? If I'm right, is there a reason one is preferred over another?