Y -4 a -1-4- a -1- If -a- is real then the least value of - y - is-A- 2-23B- C- 1-3D- 1

The correct option is B Use A.M ≥ G.M 4^(a 1)+4^( a 1)/2≥√(4^(a 1)+4^( a 1)) 4^(a 1)+4^( a 1)≥ 2(4^ 2)^1/2 y≥1/2 ...

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A.M Greater than or Equal to G.M

y =4 a -1+4- ...

Question

$y = 4^{a - 1} + 4^{- a - 1}$ . If ‘a’ is real then the least value of ‘y’ is:

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