a = b হলে, a3 - ‍7a2b + 7ab2

a = b হলে, a³ - ‍7a²b + 7ab² - b³ = কত?

A 2b

C 8a

D 6b

Correct Answer: Option B

দেওয়া আছে,
a = b

তাহলে,
a³ - ‍7a²b + 7ab² - b³
= b³ - 7.b².b + 7.b.b² - b³
= b³ - 7b³ + 7b³ - b3
= 8b³ - 8b³
= 0