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mlddmlnog Group Title

Calculus help!

  • one year ago
  • one year ago

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  1. raxis Group Title
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    Where's the question? ^^;

    • one year ago
  2. mlddmlnog Group Title
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    The derivative of \[ f(x)=\frac{ x ^{4} }{ 3 }-\frac{ x ^{5} }{ 5 }\] attains its maximum value at x=?

    • one year ago
  3. mlddmlnog Group Title
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    The answer is 1.

    • one year ago
  4. mlddmlnog Group Title
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    I found the derivative, and set it equal to zero, but 1 was not one of the values i got... :(

    • one year ago
  5. zepdrix Group Title
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    Ya the answer key is incorrect, it appears to have a max at \(x=\dfrac{4}{3}\). I keep getting x=3/4 when I work it out though, so I gotta figure out where my mistake is.

    • one year ago
  6. zepdrix Group Title
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    OH the problem was probably SUPPOSE TO BE,\[\large f(x)=\frac{x^4}{\color{salmon}4}-\frac{x^5}{5}\]

    • one year ago
  7. zepdrix Group Title
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    Because that clearly gives a critical point at x=1

    • one year ago
  8. mlddmlnog Group Title
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    ohh if you do it like that, do you get the right answer? ohh ok :pgoshh these problems :(

    • one year ago
  9. zepdrix Group Title
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    Oh yah it's x=4/3. I see where my mistake was :O Were you able to get that value?

    • one year ago
  10. mlddmlnog Group Title
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    yupp :)

    • one year ago
  11. zepdrix Group Title
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    yah looks like teacher made silly mistake c: that happens

    • one year ago
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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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