Recent content by Samael

Sorry, I was being asked to find when it occurred hence we found the X point to be 3.333333 and then substituted it back into f(x) to find the corresponding y value. My problem was in how to use the PR correctely, but that's been figured out now. Thanks again. :)

As it is in my textbook "." is what I am taught. Also those values you got don't seem to be the maximum (or minimum) values, nor can I obtain them by substituting them into f(x). Edit: My mistake, my factorising was done wrong. Should've looked like this: f'(x) = e^-^0^.^3^t(-0.075t +...

I'm having some problems with this following min/max problem. C= 0.25t{e^-^0^.^3^t} I am being asked to find the Maximum and when it occurs (t) Using the PR I obtained: 0.25t . {-0.3{e^-^0^.^3^t} + {e^-^0^.^3^t} . 0.25 Later by factoring 0.25 . e^-^0^.^3^t[(t - 0.3)] Now...

Thanks for the assistance, its much appreciated. :)

That is the Rule we have been taught, although your representation of it now makes a whole lot more sense than the method we are told to use. Thanks for that. Also factorising your equation gave: (4e^{4x} - 8e^{4X} (1-2x)^3 = -4e^{4x}(1-2x)^3

I'm not familar with that form of the product rule. I was thinking of: uv'+vu'

Sorry, I placed a totally different problem and had to go back and fix it.

Ok. However occording to the rule the problem should become: e^{4x} .-8{(1-2x)}^3 + {(1-2x)}^4. 4e^{4x} Where to go from here, I am not so sure.

I don't think I've ever heard, or been taught that rule before. Would you be able to elaborate on it?

Yes, find the derivative using the PR. The problem I'm having is that I cannot seem to simplify the problem after applying the rule. The answer to the above problem was: -4e^{4x}{(1-2x)}^3(2x+1) However a fully worked solution would explain what went on.

A problem which I'm sure is rather simple, however I cannot seem to simplify the equation properly to produce the fully simplified answer as written in my textbook. The problem being. f(x)= e^{4x}{(1-2x)}^4 Find f ' (X) All help is greately appreciated!