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GMAT 考满分题库

Magoosh - 数学PS - 92
If f(x) = x^{2} + 4 and f(2k) = 36, then which of the following is one possible value of k?
  • A\sqrt{2}
  • B2
  • C4
  • D2\sqrt{2}
  • E\sqrt{14}
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正确答案: D

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