Question 87503
x^3+1/27
= x^3 + (1/3)^3

= (x+(1/3))(x^2 - (1/3)x + (1/9))

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rs3+64r

= r(x^3 + 4^3)

= r(x+4)(x^2-4x+16)

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Cheers,
Stan H.