It means that it is an expression, and it contains one or more variables.
An "expression" is anything that can be calculated to obtain a number. For example, all of the following are expressions:
5
1 + 2
a
a + 1
2a
a + b
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Variable is any letter used in an algebraic expression, and can vary (change form) to be any number, and one variable means the same number in any single algebraic expression. Usually algebra is simplifying the expression or equation until you know what the variable is equal to.
It is an expression with a variable, x.It is an expression with a variable, x.It is an expression with a variable, x.It is an expression with a variable, x.
It could represent an unknown variable in an expression or an equation.
Variable expression.
The variable.