For , which statement about its stationary points is correct?
Answer and explanation
Correct answer: A. Local minimum at and local maximum at
- Step 1: , which is zero at and .
- Step 2: For , ; for , ; for , .
- 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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