JEE Advance - Mathematics (1993 - No. 24)
Find all possible real values of $$b$$ such that $$f(x)$$ has the smallest value at $$x=1$$.
$$b \in (-2, -1) \cup (1, \infty)$$
$$b \in [-2, -1] \cup [1, \infty)$$
$$b \in (-2, -1) \cup (1, 5)$$
$$b \in (- \infty, -2) \cup (-1, 1)$$
$$b \in (- \infty, -2] \cup [-1, 1]$$