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Answer:
x² - 9
Step-by-step explanation:
(x + 3)(x - 3)
= x(x - 3) + 3(x - 3) Distributive property
= x² - 3x + 3x - 9
= x² +( -3x + 3x) - 9 Associative
= x² + 0x - 9 Addition
= x² - 9