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Answer:
x² - 9
Explanation:
hello :
(x - 3 ) (x + 3) = x²+3x-3x-9
(x - 3 ) (x + 3) = x² - 9
(x-3)*(x+3)
we begin by expanding and then simplifying
= (x²+3x-3x-9)
= x² - 9