5. Using the Distributive Property
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Rewrite the given expression so that it is easier to make groups.
(r+9)(p-9)
To factor by grouping, we will take the greatest common factor of the first pair of terms and the greatest common factor of the second pair of terms.
Notice that (p-9) is a factor of all three terms, so we can factor it out.
Factor out (p-9)
Commutative Property of Multiplication