a + b = 3 এবং ab = 2 হলে, a³ + b³ = কত?

a + b = 3 এবং ab = 2 হলে, a³ + b³ = কত?

A 3

B 6

C 7

D 9

Solution

Correct Answer: Option D

দেয়া আছে,
a + b = 3
ab = 2

আমরা জানি,
a³ + b³ = (a + b)³ - 3ab(a + b)
= 3³ - 3 × 2 × 3
= 27 - 18
= 9