x2 + y2 = 8 এবং xy = 7 হলে, (x+y)2 -এর মান কত ?
A 14
B 22
C 25
D 11
Correct Answer: Option B
(x+y)2 = x2 + y2 + 2xy
= 8+2.7 = 8+14 = 22
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