x + y = 7 এবং xy = 6 হলে x2+y2 এর মান কত -

A 37

B 30

C 34

D 39

Solution

Correct Answer: Option A

x2+y2 = (x + y)2 - 2xy
          = 72 - 2.6
          = 49 - 12
          = 37 

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