n³ + 343
n³ - 7n² + 49n + 7n² - 49n + 343
n ( n² - 7n² + 49 ) + 7 ( n² - 7n + 49 )
= ( n + 7 ) ( n² - 7n + 49 )
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Answer:
n³ + 343
n³ - 7n² + 49n + 7n² - 49n + 343
n ( n² - 7n² + 49 ) + 7 ( n² - 7n + 49 )
= ( n + 7 ) ( n² - 7n + 49 )