A condition that x3 + ax2 + bx + c may have no extremum is

1.	A condition that x3 + ax2 + bx + c may have no extremum is
A.	a2 ≥ 3b
B.	b2 < 3b
C.	a2 < 3b
D.	b2 ≥ 3b
Answer» D. b2 ≥ 3b

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A condition that x3 + ax2 + bx + c may have no extremum is

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