i need to differentiate these 3 functions.

for a, am i supposed to use the quotient rule ? or would it just be 3x^2/1?

x by itself is equal to 1 right?

and constants are mostly ignored except for special situations?

Any help is appreciated, as i'm just learning how to do this and i don't have a textbook..

a) x^3+2 / x-5

3x^2(x-5) – 1 (x^3+2)/(x-5)^2

b) (2x^4 + x)(-4x^2 + 1)

c) Find dy/dx if y=2u^3 – 5u , u=x^3+2