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Finding critical numbers

  1. Apr 2, 2010 #1
    Find all critical numbers if any.

    I found the critical number -1/3 , just checking my work. Any input would be great.

    the function f(x) = x*sqrt2x+1
    f'(x) = (3x+1)/sqrt2x+1

    3x+1 = 0 , x = -1/3
  2. jcsd
  3. Apr 2, 2010 #2
  4. Apr 2, 2010 #3
    Critical numbers are -1/3 and -1/2
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