factories the following a^3+27
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a^3 + 27
= (a)^3 + (3)^3
using identity of x^3 + y^3 = (x+y)(x^2 - xy + y^2)
a^3 + 3^3
= (a+3){(a)^2 - (a)(3) +(b)^2}
= (a+3) (a^2 - 3a + b^2)
= (a)^3 + (3)^3
using identity of x^3 + y^3 = (x+y)(x^2 - xy + y^2)
a^3 + 3^3
= (a+3){(a)^2 - (a)(3) +(b)^2}
= (a+3) (a^2 - 3a + b^2)
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