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The product of the sum and difference of the same two terms is the difference of their squares.
k^2-9
Recall that the product of the sum and difference of the same two terms is the difference of their squares. ( a + b)( a - b)= a^2-b^2 Let's use this formula to simplify the given product.
Commutative Property of Multiplication
(a+b)(a-b)=a^2-b^2
Calculate power
