Application of DerivativeHard

Question

Let  f(x) =   the set of values of  b  for which  f(x) has greatest value at x = 1 is given by :

Options

A.1 ≤ b ≤ 2
B.b = {1, 2}
C.b ∈ (- ∞, - 1)
D.

Solution

f(1-)  ≤  f(1) and f(1+) ≤  f(1)
- 2 + log2 (b2 - 2)  ≤ 5
0 < b2 - 2 ≤ 128    2 < b2 ≤ 130

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