a cube + or - b cube

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

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

for example 53 - 23    =  \[ (5-2) (5^{2} +5 \times 2 +2^{2} ) \] 

                                     = 117

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