X^3+27 can be expressed as product of two factors:
X^3+27=x^3+3^3=(x+3)(x^2-3x+9).
Therefore x^3+27 is factorable.
But x^2+16 is not factorable,as x^2+16=x^2+4^2 can not be expressed as product of factors with non-negative integer powers.
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