x + y = 12 এবং x – y = 2 হলে, xy?
A
35
B
140
C
70
D
144
Correct Answer: 35
We have ,x + y= 12 , x - y = 2I know ,xy =x +y22 - x-y22 = 1222 -222 = 36 - 1 = 35