Maxima and MinimaHard

Question

If x be real then the minimum value of f(x) = 3^x+1 + 3^-(x+1) is-

Options

A.2

B.6

C.2/3

D.7/9

Solution

f(x) = 3^x+1 + 3^{-(x + 1)}
f(x) = 3^x+1 +
using Am ≥ Gm

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