hELLO Sir...

a^{3}+b^{3} = (a+b)^{3}-3ab(a+b) >>>This one is the formula for Expanding only...

a^{3}-b^{3} = (a-b)^{3}+3ab(a+b)

AND

a^{3}+b^{3} = (a+b) (a^{2}-ab+b^{2}) >>>This is the formula for FACTORISING....

a^{3}+b^{3} = (a-b) (a^{2}+ab+b^{2})

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