factorise it x⁶-7x³-8
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!! => ( X - 2 ) ( X +1 ) ( X² + 2X + 4 ) ( X² - X + 1 ). Hence, X6 - 7X³ -8 = ( X- 2 ) ( X+ 1 ) ( X² + 2X+4 ) (X² - X + 1 ).
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