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

A 19  

B 20

C 21

D 22

Solution

Correct Answer: Option D

(x²+y²)
= (x² + y²)+ 2xy
= 8 + 7x2
= 22

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