According to the Rational Root Theorem, which is a factor of the polynomial f of x is equal to 3 x cubed minus 5 x squared minus 12 x plus 20 ?

By the Rational Root Theorem, possible rational roots have the form p/q, where p divides 20 and q divides 3. The factor 3x − 5 would give the root x = 5/3. Substituting, f(5/3) = 0, so 3x − 5 is a factor. The correct choice is D, 3x − 5.

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