x-y=1 , xy = 56 হলে x+y=কত ?  

A 16

B 15

C 225

D 221

Solution

Correct Answer: Option B

x - y = 1
xy = 56

(x + y)2= (x - y)2 + 4xy 
            = 12 + 4 × 56
                 = 1 + 224
            = 225
            = 152
  x + y = 15

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