Math

Evaluating expressions.

Definition

Evaluating an expression means substituting given values for variables and then simplifying using the order of operations (PEMDAS/BODMAS) to find a numerical result.

How it works · 3 phases

Step by step.

  1. Substitute the given value(s) for each variable
  2. Follow the order of operations: parentheses, exponents, multiplication/division, addition/subtraction
  3. Simplify to get the final answer
Examples

Real-world.

  • 1 Evaluate 3x + 2 when x = 4: 3(4) + 2 = 14
  • 2 Evaluate a² - 2b when a = 5 and b = 3: 25 - 6 = 19
  • 3 Evaluate (n+1)(n-1) when n = 7: 8 × 6 = 48
Related terms

Tangled up with.

Variables and expressions → Order of operations → Combining like terms → Function notation →
Studied in

1 unit use this concept.

Pre-Algebra Variables and Expressions →