x+y=6,xy=8,then,x-y3=?
A
3
B
8
C
9
D
12
Correct Answer: 8
আমরা জানি, (x - y ) 2 = ( x + y)2 - 4xy = (6)2 - 4 × 8 = 36 - 32 = 4 x - y = 2 (x - y)3 = (2)3 = 8