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For any real number $c$, the polynomial $x^3 + x + c$ has exactly one real root

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1 1 For any real number $c$, the polynomial $x^3 + x + c$ has exactly one real root. how can i show that above statement is true or false.can anyone help me please real-analysis share | cite | improve this question asked Nov 23 '12 at 13:01 gumti 9 2 add a comment  |  1 1 ...