Writing and Evaluating Expressions

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (such as +, -, *, /) that represents a value.

Front

How do you evaluate an expression?

Back

To evaluate an expression, substitute the values of the variables into the expression and perform the arithmetic operations.

Front

What does it mean to evaluate 3x + 8 when x = 2?

Back

It means to replace x with 2 in the expression, resulting in 3(2) + 8 = 6 + 8 = 14.

Front

What is the value of the expression 2x + x - 10 when x = 8?

Back

Substituting x with 8 gives 2(8) + 8 - 10 = 16 + 8 - 10 = 14.

Front

What is the product of a number and a variable?

Back

The product of a number and a variable is the result of multiplying the number by the variable, represented as 'number * variable'.

Front

How can you express 'the product of 7 and j increased by 3'?

Back

This can be expressed as 7j + 3.

Front

What is the value of the expression p + 22 when p = 22?

Back

Substituting p with 22 gives 22 + 22 = 44.

Front

What does the expression 16 - y represent?

Back

It represents 'y less than 16', indicating the difference between 16 and the value of y.

Front

What is a variable in an expression?

Back

A variable is a symbol (usually a letter) that represents an unknown value in an expression or equation.

Front

What is the difference between an expression and an equation?

Back

An expression does not have an equality sign and represents a value, while an equation states that two expressions are equal.