An algebraic expression is an expression that contains numbers, operations, and one or more variables.
The numerical factor of a term that contains a variable is known as a coefficient.
A symbol (or letter) that represents one or more elements is called variables.
A term with no variable is called constant.
We therefore have to write an algebraic expression for 10 less than a variable x.
Here x is a variable which the algebraic expression is formed.
Less than means to subtract the value by 10.
So, for 10 less than a variable x, we have to subtract 10 from x.
The algebraic expression is x−10.