yang bisa tolong dong bantuannya...pakai caranya juga y

a) f(x) = x^3 - 7x^2 + 2
f'(x) = 3x^2 - 14x
b) f(x) = 6 - 1/5x^5 + 1/9x^9
f'(x) = - x^4 + x^8
c) f(x) = ax^2 + bx + c
f'(x) = 2ax + b
D) f(x) = 4 / Vx
f(x) = 4 /x^1/2
f(x) = 4x^-1/2
f'(x) = -1/2.4x^(-1/2-1)
= -2x^-3/2
= -2 / x^3/2
= -2 / xVx