In mathematics, a coefficient is a constant multiplicative factor of a specific object. For example, in the expression 9x2, the coefficient of x2 is 9. The object can be such things as a variable, a vector, a function, etc. In some cases, the objects and the coefficients are indexed in the same way, leading to expressions such as: » a_1 x_1 + a_2 x_2 + a_3 x_3 + cdots where a'n is the coefficient of the variable x'n for each n = 1, 2, 3, … In a polynomial P(x) of one variable x, the coe… (More on Coefficients)