Understanding Equivalent Expressions (Testing with Substitution)

Understanding Equivalent Expressions (Testing with Substitution)
Introduction

Two algebraic expressions are equivalent if they produce the same output for every possible input value. Testing equivalence by substitution is a reliabl...

You’re buying three notebooks, each costing $x, with a $2 customization fee per notebook.

One way to find the total cost is first to add the $2 fee to each notebook and then multiply by 3. That gives the expression 3(x + 2).

Another way is to multiply the notebook price first: three notebooks at $x each is 3x, plus three customizatio...