Question 6 • Algebra 1
A, B, and C each factor: A has a common factor of 2, while B and C factor by grouping. For D, a cubic polynomial can factor over the integers only if it has a rational root. Testing the possible rational roots (from the Rational Root Theorem) shows none are roots, so D, 9x³ + 11x² + 3x − 33, is prime.
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