x2 + y2 = 8 এবং xy = 7 হলে, (x + y)2 এর মান কত?

A 14

B 16

C 22

D 30

Solution

Correct Answer: Option C

দেওয়া আছে,
            x2 + y2 = 8 
                xy = 7

আমরা জানি, 
(x + y)2 = x2 + y2 + 2xy
             = 8 + 2 × 7
             = 8 + 14
             = 22

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