How do I do these 2?
Tried quotient rule it gave me -x^2 - 6/(x^2+x+6)^2, I don't think it's right
Tried substitution (because theres another similar question between these two on the paper and that was the way to go for it) Don't think my answers worth mentioning
OK, I was able to get your answer for b) but by using:
du/dx=0 (That gets rid of the integral part)
It would be nicee if you could show me how to do it your way (using substitution) aswel