A coefficient is a number that stands in front of a variable, an expression, or a function. Below is an algebraic expression where the terms containing variables have the coefficients 2 and -5.
Coefficients indicate how many times a particular variable appears in an expression. In this case, there are two x3-terms and five x-terms.
2(x3+x3)−5(x+x+x+x+x)+3
Note that a variable with a coefficient of 1 is usually written as if it did not have a coefficient.