x + y = 7 এবং xy = 12 হলে, x3 + y3 এর মান কত?

A 91

B 81

C 101

D 85

Solution

Correct Answer: Option A

দেওয়া আছে, x + y = 7
            এবং xy = 12

∴ x³ + y³ = (x + y)³ - 3xy(x + y)
              = (7)³ - 3.12.7
              = 343 - 252
              = 91

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