X+Y = 6 এবং XY = 6 হলে, (X-Y)2 এর মান কত?

 

A -12

B 12

C 8

D 10

Solution

Correct Answer: Option B

 (x - y)2 = (x+y)2 - 4xy 

           = (6)2 - 4 × 6 

           = 36 - 24 

           = 12 

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