For , which statement about its stationary points is correct?

Answer and explanation

Correct answer: A. Local minimum at and local maximum at

  1. Step 1: , which is zero at and .
  2. Step 2: For , ; for , ; for , .
  3. Step 3: So is a minimum (value 0) and is a maximum (value ).
Answer
local minimum at x = 0, local maximum at x = 2.
Why not the others: Swapping the types reads the sign change backwards; comes from differentiating ; ignoring misses the factor .

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