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

A 14

B 16

C 22

D 24

Solution

Correct Answer: Option C

(x+y)2 = x2 + 2xy + y2 

= x2 + y2 + 2xy 

= 8 + (2×7) 

= 8 + 14 = 22 

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