x + y = 8, x-y = 6 হলে x2+ y2 এর মান কত?

 

A 40  

B 50  

C 60  

D 70  

Solution

Correct Answer: Option B

 দেওয়া আছে, x + y = 8

এবং, x - y = 6

={(x + y)2 + (x - y)2}/2

={(8)² + (6)²}/2

 = (64 +36)/2 = 100/2 = 50

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