Evaluating Expressions with Variables

Front

What is a variable in an expression?

Back

A variable is a symbol, often a letter, that represents an unknown value in an expression or equation.

Front

Evaluate the expression 3a - 2 when a = 4.

Back

10

Front

What does it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by substituting the variables with their given values.

Front

Evaluate the expression 6g + 4 when g = 3.

Back

20

Front

What is the order of operations used in evaluating expressions?

Back

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

Front

Evaluate the expression 2x + 5 if x = 3.

Back

11

Front

What is the result of squaring a number?

Back

Squaring a number means multiplying the number by itself.

Front

Evaluate 3x² if x = 5.

Back

75

Front

What is a constant in an expression?

Back

A constant is a fixed value that does not change, such as the number 5 in the expression 3x + 5.

Front

Evaluate the expression 2f - 3 when f = 8.

Back

13