GMAT Focus 2026 Daily Challenge

If x + 1/x = 6, find x³ + 1/x³.

A. 198
B. 204
C. 210
D. 216

Answer:

Using the identity:

x³ + 1/x³ = (x + 1/x)³ − 3(x + 1/x)

= 6³ − 3(6)

= 216 − 18

= 198

Answer = A. 198