In elementary mathematics, a term is either a single number or variable, or the product of several numbers or variables. Terms are separated by a + or - sign in an overall expression. For example, in 3 + 4x + 5yzw.
I would say b(n-1) however it's been awhile since I took a module in terms, so you might as well use the other answer if it's different..... sorry if i mislead you.
