Unit 3: Expressions, Equations, and Inequalities

Algebraic Expression : A mathematical phrase that contains operations, numbers, and at least one variable.

Exponent : A number that indicates how many times its base is used as a factor

Equation : A mathematical sentence or statement that two quantities are equal.

Inequality : A mathematical sentence or statement that two expression are not equal.

Commutative Property of Addition : In addition, the order of the terms does not change the sum.

Inverse Property of Multiplication : Any number multiplied by its reciprocal will always equal one. 3 x 1/3 = 1

Terms : A number, a variable, or a product of numbers and variables separated by addition or subtraction.

Like Terms : Terms that contain the same variables raised to the same power.

Inverse Operations : Two operations that undo each other. Also known as Opposite Operations.

Numerical Expression : A mathematical phrase that contains numbers and operations. May be simplified using the Order of Operations (PEMDAS).