Variable Expressions

Front

What is a variable in mathematics?

Back

A variable is a symbol used to represent an unknown value in mathematical expressions and equations.

Front

Evaluate the expression 5g when g = 4.

Back

20

Front

What is the result of the expression 65 - y when y = 23?

Back

42

Front

How do you evaluate the expression 8 + n for n = 7?

Back

Substitute 7 for n: 8 + 7 = 15.

Front

Identify the variable in the expression 20 - 2x.

Back

x

Front

Evaluate the expression 2x^3 for x = 3.

Back

54

Front

What is the purpose of evaluating an expression?

Back

To find the numerical value of the expression by substituting the variable with a specific value.

Front

What does the term 'expression' mean in mathematics?

Back

An expression is a combination of numbers, variables, and operators (such as +, -, *, /) 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 states that two expressions are equal.

Front

How do you simplify the expression 3x + 2x?

Back

Combine like terms: 3x + 2x = 5x.