x+y=6,xy=8,then (x-y)3=?

x+y=6,xy=8,then (x-y)³=?

A 3

B 8

C 9

D 12

Solution

Correct Answer: Option B

আমরা জানি, (x-y)²=(x+y)²-4xy
=6²-4×8=36-32=4
(x-y)²=4
∴ x-y=2
∴ (x-y)³=2³=8