x-y = 4 এবং xy = 60 হলে, x+y এর মান কত?

A 16

B ±16

C 4

D ±64

Solution

Correct Answer: Option B

 x+y = √(x-y)^2 + 4xy 
       = √(4)^2 + 4×60  
       = ±16 

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