Constant

Definition

A constant is a fixed value that does not change. In algebra, constants are often represented by numbers or letters that remain the same throughout an equation or expression.

5 Must Know Facts For Your Next Test

1. Constants can be positive, negative, whole numbers, fractions, or irrational numbers.
2. In equations, constants are often represented by letters such as $c$ or $k$.
3. The value of a constant remains unchanged regardless of the variables in the equation.
4. Constants are used to define specific quantities and simplify algebraic expressions.
5. In trigonometry, constants can denote values like $\pi$ (pi) which is approximately equal to 3.14159.

Review Questions

• What is the role of a constant in an algebraic expression?
• How does a constant differ from a variable in an equation?
• Can you identify the constants in the expression $2x + 3y = 7$?

Related terms

Variable: A symbol that represents an unknown value and can change within the context of mathematical problems.

Coefficient: A numerical or constant quantity placed before and multiplying a variable in an algebraic expression (e.g., $4$ in $4x$).

$\pi$ (Pi): $\pi$ is a mathematical constant representing the ratio of a circle's circumference to its diameter, approximately equal to $3.14159$.