Question

Calculus help!

Answer 1

Where's the question? ^^;

Answer 2

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

Answer 3

The answer is 1.

Answer 4

I found the derivative, and set it equal to zero, but 1 was not one of the values i got... :(

Answer 5

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.

Answer 6

OH the problem was probably SUPPOSE TO BE,\[\large f(x)=\frac{x^4}{\color{salmon}4}-\frac{x^5}{5}\]

Answer 7

Because that clearly gives a critical point at x=1

Answer 8

ohh if you do it like that, do you get the right answer? ohh ok :pgoshh these problems :(

Answer 9

Oh yah it's x=4/3. I see where my mistake was :O
Were you able to get that value?

Answer 10

yupp :)

Answer 11

yah looks like teacher made silly mistake c: that happens