Curve sketching problem

f(x)=x2ln(x)

  1. What is the domain of the function?
  2. Does this function have any intercepts with the axis?
  3. What are the turning points?
  4. What is the x value of the point of inflection?
  5. Sketch the graph.

Answers:

  1. x>0
  2. f(x)=0=x^2 ln(x)             x=1           f(x) has a x-intercept at (1,0).
  3. f ‘(x)=2x ln(x)+x=0         x=0 & x=e^(-1/2)
  4. f ”(x)=3+2ln(x)=0           x=e^(-3/2)
  5. 屏幕快照 2015-11-18 22.50.09

 

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