x + y = 3, xy =2 হলে, x3+y3 এর মান কত?

A 9

B 18

C 19

D 27

Solution

Correct Answer: Option A

দেওয়া আছে,
x + y = 3
xy = 2

∴ x3 + y3
= (x + y)3 - 3xy(x + y)
= 33 - 3 × 2 × 3
= 27 - 18
= 9

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