How Do You Evaluate an Algebraic Expression?

How Do You Evaluate an Algebraic Expression?

Note:

Plugging variables into an expression is essential for solving many algebra problems. See how to plug in variable values by watching this tutorial.

Keywords:

  • plug in
  • plugging in
  • substitution
  • problem
  • expression
  • variable
  • variables
  • substitute

Background Tutorials

  • Write expressions that record operations with numbers and with letters standing for numbers.

      • What Are Numerical and Algebraic Expressions?What Are Numerical and Algebraic Expressions?

      What Are Numerical and Algebraic Expressions?

      An expression is just a mathematical phrase. In this tutorial, you'll learn about two popular types of expressions: numerical and algebraic expressions. A numerical expression contains numbers and operations. An algebraic expression is almost exactly the same except it also contains variables. Check out this tutorial to learn about these two popular kinds of expressions!

  • Evaluate expressions at specific values of their variables. Include expressions that arise from formulas used in real-world problems. Perform arithmetic operations, including those involving whole-number exponents, in the conventional order when there are no parentheses to specify a particular order (Order of Operations).

      • What is a Variable?What is a Variable?

      What is a Variable?

      You can't do algebra without working with variables, but variables can be confusing. If you've ever wondered what variables are, then this tutorial is for you!

      • What is the Substitution Property of Equality?What is the Substitution Property of Equality?

      What is the Substitution Property of Equality?

      If you ever plug a value in for a variable into an expression or equation, you're using the Substitution Property of Equality. This property allows you to substitute quantities for each other into an expression as long as those quantities are equal. Watch this tutorial to learn about this useful property!

Further Exploration

  • Evaluate expressions at specific values of their variables. Include expressions that arise from formulas used in real-world problems. Perform arithmetic operations, including those involving whole-number exponents, in the conventional order when there are no parentheses to specify a particular order (Order of Operations).

      • How Do You Evaluate an Algebraic Expression by Plugging In Values?How Do You Evaluate an Algebraic Expression by Plugging In Values?

      How Do You Evaluate an Algebraic Expression by Plugging In Values?

      Sometimes you have an algebraic expression with variables, and you know the values of those variables exactly, and you just need to plug in those values and get the value of the expression. Well, if that's what you have to do, then you've come to the right place, because this tutorial will show you exactly how to do it!