Sign – can be positive or negative. You usually do not write the plus sign in the beginning of an expression if the term is positive.
**Coefficient** – is always a number. If the number is 1, you usually do not write it out.
**Variable **– can be one or several letters.
**Exponent** – is usually a number. If the number is 1 then you do not write it out. In advanced mathematics the exponent can even be for example a variable or a fraction.
An algebraic expression consists of one or more terms.
An expression with:
**•** one term is called a **monomial, -6***x*^{2}.
**•** two terms is called a **binomial, 3***a* + *b*.
**•** three terms is called a **trinomial**, *y*^{2} -2*y* + 5.
An algebraic expression with three or more terms is usually called a **polynomial**. |