A. 2x^2+5x-12 = (2 x - 3) (x + 4), factorable
B. 9x^2 + 4 not factorable
C. 5x^2 +5x + 1 not factorable
D. 3x^3 + 6x^2 = 3x^2(x + 2), factorable
Answer: B and C
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