How do algebraic expressions work?

Algebraic expressions are combinations of variables, numbers, and operations like addition or multiplication. For example, “3x + 2” is an expression, where 3x means three times a number and 2 is added. These expressions represent values that can change depending on what the variable equals. Expressions don’t have equal signs; they are not complete equations. They help us describe mathematical ideas in a general form. We can simplify expressions, substitute values into them, or use them to build equations that help solve real-world problems.