问题
单项选择题
If x2+9x-3=3x2+2x(4-x), then x2=（）.
A. 2
B. 3
C. 4
D. 9
E. 16
答案
参考答案：D
解析：
The statement 3x2+2x(4-x) can be restated as x2+8x. Thus, the original equation can be restated as x=3, so x2=9.
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