Tuesday 17 August 2021

The polynomial \(x^{4}+4 x+c=0\) has at least one real root if and only if \(\qquad\) (a) \(c<2;\)\(\qquad\) (b) \(c \leq 2;\)\(\qquad\) (c) \(3>c\)\(\qquad\) (d) \(c \leq 3.\)
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