x2+y2=34 & xy = 15 , (x-y)2=?
A
6
B
5
C
4
D
7
Correct Answer: 4
দেয়া আছে, x2 + y2 = 34 , xy = 15 .'. (x - y)2 = x2 + y2 - 2xy = 34 - 2.15 = 34 - 30 = 4