x + y = 8 , x - y = 6 হলে , x2 +y2 - এর মান -
A
40
B
60
C
50
D
80
Correct Answer: 50
x2 + y2 = 12{(x + y)2 + (x - y)2} = 12{(82 + 62)} = 12 ×100 = 50