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A cube - b cube = (a-b)(a square + ab + b square )
you can now solve the problem now I think 
the answer is )(a square + ab + b square )
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A^3-b^3 = (a-b)(a^2 + ab +b^2)  [Property]

So (a^3-b^3)/(a-b) = a^2 + ab + b^2
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