Evaluating 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, 3x + 5 is an algebraic expression.

Front

How do you write an algebraic expression for 'a number subtracted from eight'?

Back

8 - n

Front

What does it mean to evaluate an expression?

Back

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

Front

Evaluate 6y - 13 if y = 4.

Back

11

Front

Evaluate 3d if d = 5.

Back

15

Front

Evaluate 5x + 4y if x = 3 and y = 2.

Back

23

Front

Evaluate the expression for x = 2: 4 - x.

Back

2

Front

What is the value of the expression 2a + 3b when a = 1 and b = 2?

Back

8

Front

What is a variable in an algebraic expression?

Back

A variable is a symbol, often a letter, that represents an unknown number. For example, in the expression 5x, x is the variable.

Front

What is a constant in an algebraic expression?

Back

A constant is a fixed value that does not change. For example, in the expression 3x + 4, the number 4 is a constant.