题目
单项选择题
The graph of the function [math: f(x)] is shown here. The rule for [math: f(x)] is:
选项
A.A. [math: f(x)=(x+2)(x−1)2(3−x)] f(x)=(x+2)(x-1)^2(3-x)
B.B. [math: f(x)=(x−2)(x+1)2(x+3)] f(x)=(x-2)(x+1)^2(x+3)
C.C. [math: f(x)=(x+2)(x−1)2(x−3)] f(x)=(x+2)(x-1)^2(x-3)
D.D. [math: f(x)=(x−2)(x−1)2(x−3)] f(x)=(x-2)(x-1)^2(x-3)
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标准答案
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思路分析
To solve, we first identify the x-intercepts and their multiplicities from the graph, then match those with the polynomial factors provided.
Option A: f(x)=(x+2)(x−1)^2(3−x) expands to a product with a factor (3−x) which is the same as −(x−3). This flips the end behavior relative to a positive leading coefficient. The intercepts would be at x=−2, x=1 (double root), and x=3, but the overall sign pattern and end behavior i......Login to view full explanation登录即可查看完整答案
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