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Which equation shows that the real number system needs extending?
Ax + 1 = 0
Bx^2 - 1 = 0
Cx^2 + 1 = 0
Dx^2 = 4
Answer & Solution
Correct answer: C. x^2 + 1 = 0
The square of every real number is non-negative, so x^2 = -1 has no real solution.
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