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Factorise:- x³-729 pls answer quickly |
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Answer» Answer You have to OBSERVE that 729=93 , and so x3−729 is a DIFFERENCE of CUBES. a3−b3=(a−b)(a2+ab+b2) , and (a2+ab+b2) is no longer factorizable (it is also known as "false SQUARE", because it resembles (a+b)2 , but the MIXED product is halved). |
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