Answer :
Answer:
857.3/8
Step-by-step explanation:
First of all we find the value of z
z^2=z+18
z^2-z-18=0
solving by discriminant method
z=(1+√1+72)/2 and (1-√1+72)/2
Taking positive value
z=(1+√73)/2
=1+8.5/2
=9.5/2
z^3= (9.5*9.5*9.5)/2*2*2
=857.3/8