isi-entrance 2021 Q15

isi-entrance · India · UGA Stationary points and optimisation Count or characterize roots using extremum values

The polynomial $x ^ { 4 } + 4 x + c = 0$ has at least one real root if and only if
(A) $c < 2$.
(B) $c \leq 2$.
(C) $c < 3$.
(D) $c \leq 3$.

The polynomial $x ^ { 4 } + 4 x + c = 0$ has at least one real root if and only if\\
(A) $c < 2$.\\
(B) $c \leq 2$.\\
(C) $c < 3$.\\
(D) $c \leq 3$.