9.
a) f(x)=12x^4+5x²-3x-8
f'(x)=4·12x³+2·5x-3
f'(x)=48x³+10x-3
b) f(x)=48x³+10x²-3
f'(x)=3·48x²+2·10x
f'(x)=144x³+20x
c) f(x)= 12x³+20x-3
f'(x)=3·12x²+20
f'(x)=36x²+20
d) f(x)=48x³+10x-3
f'(x)=3·48x²+10
f'(x)=144x²+10
Uwaga :
Jeśli f(x)=x^n , to f'(x)=nx^(n-1) .