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mlddmlnog

  • 2 years ago

Calculus help!

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  1. raxis
    • 2 years ago
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    Where's the question? ^^;

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

  3. mlddmlnog
    • 2 years ago
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    The answer is 1.

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

  5. zepdrix
    • 2 years ago
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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.

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

  7. zepdrix
    • 2 years ago
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    Because that clearly gives a critical point at x=1

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

  9. zepdrix
    • 2 years ago
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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?

  10. mlddmlnog
    • 2 years ago
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    yupp :)

  11. zepdrix
    • 2 years ago
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    yah looks like teacher made silly mistake c: that happens

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