Unit 6 Test Review

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (such as +, -, *, /) that represents a value but does not include an equality sign.

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 involved.

Front

What is the distributive property?

Back

The distributive property states that a(b + c) = ab + ac, meaning you can distribute a factor across a sum.

Front

What is a variable in mathematics?

Back

A variable is a symbol, often 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.

Front

What is the value of the expression 5x + 4 when x = 2?

Back

The value is 5(2) + 4 = 10 + 4 = 14.

Front

How can you simplify the expression 4 + 4x + x?

Back

You can combine like terms to get 4 + 5x.

Front

What is the result of the expression (x • 2 • 4)?

Back

The result is 8x, since 2 • 4 = 8.

Front

What does it mean to combine like terms?

Back

Combining like terms means to add or subtract terms that have the same variable raised to the same power.

Front

What is the equivalent expression for 9 + (x • 8)?

Back

It is equivalent to 9 + 8x, since multiplication is commutative.