How would I start for a problem like this?

Can anyone solve this problem with steps. I don't know what to do after using the quotient and product rule on the problem below.

Find the derivative of the function.

g(x) = (4 + 5x)^5(4 + x - x^2)^6

Another problem I am stuck on is the one below. How would I start the problem, can anyone show the steps to solve the problem?

Find the derivative of the function.

G(y)= $\displaystyle (y-2)^4/(y^2+4y)^9$

Thanks for any replies, it would be great to get a reply as soon as possible.