An algebraic expression is a combination of constant numbers (or 'integers'), unknown variables represented by letters, and basic operations. When we assign numerical values to each of the unknown variables, we can reduce the expression to a numerical value.

If you are unsure about these terms, you can click on the link for more information about variables in algebraic expressions.

**For example:**

If we take the algebraic expression $X+5$ and assign the variable $X$ a value equal to $3$, then the value of the algebraic expression will be $8$.

**Algebraic expression:**

$X+5$**Algebraic****expression after having given the variable****$X$****a value of****$3$****:**

$5+3$**Therefore, the value (result) of the algebraic expression is****$8$****:**

$5+3=8$

If the same variable appears several times in an algebraic expression, each has the same numerical value.