Algebraic expression

An algebraic expression combines variables, constants, and operations to represent a mathematical quantity. Unlike an equation, it does not assert that two quantities are equal.

Variable (mathematics): A symbol representing a quantity that may vary or remain unspecified. Variables let an expression represent quantities without fixing their values.
Order of operations: Conventions that determine the sequence in which parts of a mathematical expression are evaluated. These conventions resolve how nested operations in an expression are grouped.
Equation: A mathematical statement asserting that two expressions have equal value. An equation states equality; an expression alone makes no such claim.
Function (mathematics): A relation that assigns each input in a domain exactly one output. An expression can serve as a rule for calculating a function’s output.
Algebra: A branch of mathematics that studies symbols, structures, and rules for manipulating them. Expressions are basic objects manipulated throughout algebra.
Constant (mathematics): A quantity whose value is fixed within a given mathematical context. Constants supply fixed values alongside variables in expressions.
Parentheses: Punctuation marks used in mathematics to group terms and indicate structure or precedence. Parentheses override default operation order by explicitly grouping parts.
Inequality (mathematics): A mathematical statement comparing quantities using relations such as less than or greater than. An inequality makes a comparison that an expression by itself does not.
Formula: A mathematical rule, commonly written symbolically, that expresses a relationship among quantities. Formulas use expressions to state calculable relationships between quantities.
Mathematical notation: The system of symbols and conventions used to express mathematical ideas. Expressions rely on shared notation to communicate quantities and operations.

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