1. h= 1 + x - x^2
.....................40
If it helps, put the demoniator as a fraction out the front of the equation. E.g.
h = 1 +x - 1 . x^2
................40
then dh/dx = 0 + 1 - 2 . x
.................................40
and then simplify the fraction.
for n= 24x^2 - x^3...