Question

if r^3=1728 and s=6859^1/3 , then find s2-r2=

Answer 1

r^3=1728 = (12)^3= 12
s=6859= ((19)^3)^1/3
= (19)^3*1/3
=19
so s^2 - r^2 = 19^2 -12^2
= 361 - 144
= 217 ans.