Find the local extreme value of the function f(x) = ex

  1. 1
  2. 0
  3. 2.81
  4. Function does not have local maxima or minima.

Answer (Detailed Solution Below)

Option 4 : Function does not have local maxima or minima.
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Detailed Solution

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Concept:

Following steps to finding maxima and minima using derivatives.

  • Find the derivative of the function.
  • Set the derivative equal to 0 and solve. This gives the values of the maximum and minimum points.
  • Now we have find second derivative.
  1. f``(x) is less than 0 then the given function is said to be maxima
  2. If f``(x) Is greater than 0 then the function is said to be minima

Calculation:

Given:

f(x) = ex

Differentiating with respect to x, we get

⇒ f’(x) = ex

For maximum value f’(x) = 0

∴ f’(x) = ex = 0

Exponential function can never assume zero for any value of x, therefore function does not have local maxima or minima.

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