Post exactly what you are trying to do.
Post a screen-shot if possible.
[IMG]file:///C:/DOCUME%7E1/OPENUN%7E1/LOCALS%7E1/Temp/moz-screenshot.jpg[/IMG][IMG]file:///C:/DOCUME%7E1/OPENUN%7E1/LOCALS%7E1/Temp/moz-screenshot-1.jpg[/IMG][IMG]file:///C:/DOCUME%7E1/OPENUN%7E1/LOCALS%7E1/Temp/moz-screenshot-2.jpg[/IMG][IMG]file:///C:/DOCUME%7E1/OPENUN%7E1/LOCALS%7E1/Temp/moz-screenshot-3.jpg[/IMG][IMG]file:///C:/DOCUME%7E1/OPENUN%7E1/LOCALS%7E1/Temp/moz-screenshot-4.jpg[/IMG] I have to use the symbolic differentiation and the 'simplify' keyword to find an expression for the derivative of f'(x). (you may need to put x=x in your worksheet)
Now my function is
f(x)= 8x(5-2x)(13+2x)/(2+x)^2
When I simplify it give
8x(5-2x) (13+2x)/(2+x)^2
It doesn't look right for a derivative of f'(x), it just change to (13+2x)/(2+x)^2.
Hope you understand. I try screenshot and attached my file, it's not working
[IMG]file:///C:/DOCUME%7E1/OPENUN%7E1/LOCALS%7E1/Temp/moz-screenshot-7.jpg[/IMG]
Oh, I try the dx function but it is not working for me. Next exercise ask to solve the equation f'(x)=0 (using a solve block), I try with your result and give me a massive page of calculation, but they ask the answer to 6 d.p.
Don't know what I'm doing wrong
[IMG]file:///C:/DOCUME%7E1/OPENUN%7E1/LOCALS%7E1/Temp/moz-screenshot-11.jpg[/IMG][IMG]file:///C:/DOCUME%7E1/OPENUN%7E1/LOCALS%7E1/Temp/moz-screenshot-12.jpg[/IMG]
I attached my files, the first line I try under f(x), the Third line is the way you did it with dx and the middle one is when I try to solve it.
Hope the attachment works