x + y = 8, x-y = 6 হলে x2+ y2 এর মান কত?
A 40
B 50
C 60
D 70
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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