Expressions and formulas.

Lesson 's Glossary
Lesson's Content
Vocabulary Puzzle

Constant (monomial): It is a number or value that remains always the same. Never changes.

Evaluating a variable expression: Given an expression and values for the variables, it is the process of substituting these values in the expression and simplify it following the order of operations.

Formula: Any equation which states a rule in a relationship.

Grouping symbol: Parentheses, brackets, fraction bar are grouping symbols used to enclose an expression that should be simplified before other operations are performed.

Numerical expression: Any expression naming a particular numbers; also a numeral.

Power of a number: The product we obtain when a number is multiplied by itself a number of times; 3x3x3x3 is the fourth power of 3 or 34

Quadratic formula: Solutions of a quadratic equation in the form ax² + bx + c =0 and b² - 4ac needs to be equal or greater than zero to yield real numbers.

Simplifying a numerical expression: Changing any expression to the simplest name for its value.

Value of a numerical expression: The resulting number of the expression.

Expressions and Formulas. Order of operations.

You have an arithmetic expression in front of you, and you wonder: Do I have to add first, or do I multiply first? Maybe, you don't know if you have to do the parenthesis first, or the fraction.

This lesson will guide you in a simple way to the process, the orden of operations; when you work with expressions, or when you substitute in formulas. You will be an expert at the end of the lesson!