Unit 6 - Equivalent Numerical and Algebraic Expressions Review

Front

What is a variable?

Back

A variable is a letter or symbol used to represent a quantity that can change.

Front

What is a constant?

Back

A constant is a number in an expression whose value does not change.

Front

Which expression is equivalent to 34x + (12x + 7x)?

Back

(34x + 12x) + 7x

Front

Identify the error in the following expression: 5 - 3 + 2 = 5 - 5 = 0

Back

Addition was done first and you should have subtracted first.

Front

What is an algebraic expression?

Back

An algebraic expression is an expression that contains at least one variable.

Front

What does it mean for two expressions to be equivalent?

Back

Two expressions are equivalent if they have the same value for all values of the variables.

Front

What is the coefficient in the expression 5x + 3?

Back

The coefficient is 5, which is the number multiplied by the variable x.

Front

How do you simplify the expression 2(x + 3) + 4?

Back

You distribute to get 2x + 6 + 4, which simplifies to 2x + 10.

Front

What is the difference between an expression and an equation?

Back

An expression is a combination of numbers and variables without an equality sign, while an equation states that two expressions are equal.

Front

What is the first step in evaluating the expression 3(x + 4) when x = 2?

Back

Substitute 2 for x to get 3(2 + 4).