x+y = √7 এবং y = x-√3 হলে xy এর মান কত?

A 3

B 4

C 2

D 1

Solution

Correct Answer: Option D

  x+y = √7 

এবং y = x-√3 

 x - y = √3 

 xy = (x+y)^2 - (x-y)^2/4  

     = (√7)^2 - (√3)^2/4  = 7-3/4  

    xy = 1 

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