Use algebraic and/or graphical methods to solve the inequality.x3 + 10x2 + 31x ? -30
A. x ? -5 or -3 ? x ? -2
B. x < -5 or -3 < x < -2
C. x ? 2 or 3 ? x ? 5
D. -5 ? x ? -3 or x ? -2
Answer: A
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, 0 < ? < 
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.
A. 
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D. 
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, 
, - 
, 
, . . . (reciprocals of squares with alternating signs)
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