I've answered this question but I can't get e right (I assume j'(m)*k'(m)=l'(m), but I can't make it work).

a. Calculate j'(m) and k'(m)

b. l(m)=j(m)*k(m), work out a polynomial expression for l(m).

c. Calculate l'(m)

d. Calculate j'(m)*k'(m)

e. What do you notice about your answers to parts c and d?

...

I see no corrilation, that's why I need help. I think I didn't work out a polynomial properly? If someone could explain that'd be great.