a differentiate problem?

Question

i posted this in the wrong forum, this should be right

I need to differentiate these 2, can anyone help?

a) f (x) = 3x^3 - 2 / 2x

and

b) y = -8e^2-5x

I really dont get these so help would be appreciated, thanks

Answer 1

a) f (x) = (3x^3 - 2) / 2x = 1.5x^2 - 1/x
f'(x) = 3 + 1/x^2

b) y = -8e^(2-5x)
y' = 40e^(2-5x)

Answer 2

Power rule: f(x) = x^n --> f'(x) = n*x^(n-1)

a) f(x) = 3x^3 - 2/2x = 3x^3 - x^-1
f'(x) = 9x^2 + x^-2

For b, do you mean -8e^2 - 5x or -8x^2 - 5x?