8th Grade · Expressions & Equations
Distributive Property
8.EE.C.7b
Definition
Multiplying a factor by a sum or difference inside parentheses by multiplying it by each term separately. a times the quantity b plus c equals ab plus ac.
Examples
- 3(x + 5) = 3x + 15.
- 4(2x - 3) = 8x - 12.
Key rule
Distribute the outside factor to every term inside — don't forget the second term.
Memory hook
Multiply the outside number by everyone inside.