Can someone help with this exercise? stuck on a probabily silly part

[ferrika3]

Hello!
I have to complete an assignment and one of the exercises says:


I have been working on it for a while and i always get a 1/4 too much, is it solvable or can it be an error of the text?
this is what i get:


Thank you so much for your time and help

 

[Steven G]

Your 3rd line is not correct. Try again and post back your results

 

[lex]

[MATH]\frac{dy}{du}=4u^3\quad [/MATH] (not [MATH]u^3[/MATH])

 

[ferrika3]

Thank you all for the help, I am sorry for the late answer but work got in the way. Here's the corrected version which hopefully should be correct.

 

[lex]

That's it. (With x≥1, y≥0 assuming Real numbers).

 

[ferrika3]

Thank you!

 

[lex]

You're welcome.