Evaluating Algebraic Expressions

Front

What is an algebraic expression?

Back

An algebraic expression is a mathematical phrase that can include numbers, variables, and operation symbols. For example, 2x + 3 is an algebraic expression.

Front

Evaluate the expression: 10 + 2r when r = 5.

Back

20

Front

Evaluate the expression: 2a + 4b when a = 10 and b = 6.

Back

44

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: 2r + 1 when r = 3.

Back

7

Front

Evaluate the expression: 6h + 30 when h = 6.

Back

66

Front

Evaluate the expression: 7y - 3y when y = 2.

Back

8

Front

What is a variable in algebra?

Back

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

Front

What is the coefficient in the expression 4x + 5?

Back

The coefficient is the number in front of the variable, so in this case, the coefficient of x is 4.

Front

What is the constant in the expression 4x + 5?

Back

The constant is the term without a variable, so in this case, the constant is 5.