If x2+9x-3=3x2+2x(4-x), then x2=

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问题 If x2+9x-3=3x2+2x(4-x), then x2=

选项 A、2
B、3
C、4
D、9
E、16

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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