The equation x^3 + x - 1 = 0: how many real roots

1. A.
   no real root
2. B.
   exactly two real roots
3. C.
   exactly one real root
4. D.
   all three real roots

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1. A.
   no real root
2. B.
   exactly two real roots
3. C.
   exactly one real root.
4. D.
   more than two real roots.

Tap an option to check your answer.