11 Evaluating variable expressions pg 41

Front

What is a variable in mathematics?

Back

A symbol used to represent an unknown value, often denoted by letters like x, y, or m.

Front

What does it mean to evaluate an expression?

Back

To calculate the value of an expression by substituting the variables with their given values.

Front

Evaluate the expression: 5m + 9n if m = -7 and n = 4.

Back

1

Front

What is the value of the expression x² + y² + x - y when x = -1 and y = 3?

Back

6

Front

Evaluate m² if m = 7.

Back

49

Front

What is the order of operations in mathematics?

Back

The order is Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right). Often abbreviated as PEMDAS.

Front

What is an expression in mathematics?

Back

A combination of numbers, variables, and operators (like +, -, *, /) that represents a value.

Front

What is the difference between an expression and an equation?

Back

An expression does not have an equality sign, while an equation does.

Front

What does it mean to substitute a variable?

Back

To replace a variable with a specific value.

Front

Evaluate the expression: 3x + 2 if x = 2.

Back

8