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  1. A

    Why does the second derivative fail for y=x^4 and other similar functions?

    Oh ok. Would I have to test surrounding points for every stationary point tested this way?
  2. A

    Why does the second derivative fail for y=x^4 and other similar functions?

    Hey guys, I was wondering why the second derivative gives me an incorrect answer to this question: 'Find the coordinates and nature of the stationary points on the curve y= x4.' Knowing the graph for the curve, the answer is obviously (0,0) as a minimum turning point. I've obtained the...
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