What do these brackets mean Calculus!!

Do the brackets around the equation in part 3(a) (iii) mean that you have to differentiate what is in the brackets first and then apply the chain rule, would you also have to apply the chain rule to the term with the 4ln (7x) in it as well

The equation is included below, thanks

Attachment 23009http://www.mathhelpforum.com/math-he...isc/pencil.png

The brackets are just there to show that the whole expression within is raised to the power . Are you aware of the general rule for differentiating something of the form ?

yeah so its goin to be a chain rule within a chain rule or is it just going to be a straightforward chain rule equation after you assign what is in the brackets to lets say t and then differentiate that

Oh, you mean you want to solve it via a substitution. You don't have to solve it that way, which is why I was confused. Letting

And then using the fact that is the way to go. Why do you think you need to use the chain rule twice?

Would this be the worked answer or am I missing something thanks

Sorry I know the x after the 7 on the last line is missing and the power of 3 is also missing

You start off correctly, but towards the end you get into a ball of confusion.



and





Have another attempt.