Answer (Detailed Solution Below)

Option 3 : e1/e
Free
NDA 01/2025: English Subject Test
30 Qs. 120 Marks 30 Mins

Detailed Solution

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Concept:

Steps to find the maxima and minima

1.find  and equate to zero

2. find the value of x i. e. critical point

3. for the maximum value we put x in f(x) to get the value of f(x)  at the point.

Calculations:

Given, f(x) = 

Consider, y = 

Taking log on both side, we get

ln y = x ln()

⇒ln y = -x ln x

⇒(1/y) × 

Equating 

⇒ x = 

So, for the maximum value we put x = in f(x) to get the value of f(x)  at the point.

f(x) = e1/e

Hence, The maximum value of  is e1/e

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