单选题
If x
2
+9x-3=3x
2
+2x(4-x), then x
2
=
A. 2
B. 3
C. 4
D. 9
E. 16
A
B
C
D
E
【正确答案】
D
【答案解析】
The statement 3x
2
+2x(4-x) can be restated as x
2
+8x. Thus, the original equation can be restated as x=3, so x
2
=9.
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