In the following question and its answer,can you tell me how to solve it and why is there a negative

Asked by nehabhat2008 | 3rd Jun, 2008, 06:25: PM

Expert Answer:

 

x3 + y3 = (x + y)(x2 - xy + y2)

8x3 + 27y3 = (2x)3 + (3y)3 = (2x+3y) (4x2 + 9y2 - 6xy)

Answered by  | 3rd Jun, 2008, 08:53: PM

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