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Question : Which of the following best describes imaginary numbers?
: 84332

Which of the following *best* describes imaginary numbers?

**A.** They are the values of expressions of the form \(\sqrt{-a}\) for various real numbers *a*, as long as *a* %u2260 0.

**B.** They consist of two values, the principal imaginary number *i* and its negative %u2013*i*.

**C.** They are not numbers, but are useful in solving equations.

**D.** They are the complex numbers.

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