2000 AMC 12竞赛试题/第22题
Problem
The graph below shows a portion of the curve defined by the quartic polynomial
. Which of the following is the smallest?


Solution
Note that there are 3 maxima/minima. Hence we know that the rest of the graph is greater than 10. We approximate each of the above expressions:
According to the graph, ![]()
The product of the roots is
by Vieta’s formulas. Also,
according to the graph.
The product of the real roots is
, and the total product is
(from above), so the product of the non-real roots is
.
The sum of the coefficients is ![]()
The sum of the real roots is
.
Clearly
is the smallest.
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