Question 121154
Find f(1/2) for f(x)=x^3 -2

f(1/2)=(1/2)^3 -2

=> f(1/2)=(1/8) -2    
[Note: For (1/2)^3 just raise top and bottom to power of 3 and get 1/8]

=>f(1/2)= (1-16)/8

=>f(1/2)= (-15)/8

So, f(1/2)=(-15)/8 for when f(x)=x^3 -2