x + 2/x = 3 হলে x3 + 8/x3 = কত?

x + 2/x = 3 হলে x³ + 8/x³ = কত?

A 16

B 9

C 8

Solution

Correct Answer: Option B

x³+8/x³=(x)³+(2/x)³
=(x+2/x)³-3.x.2/x(x+2/x)
=(3)³-6×3
=27-18
=9