যদি (x - y)2 = 14 এবং xy = 2 হয়, x+ y2 = কত?  

A 12

B 14

C 16

D 18

Solution

Correct Answer: Option D

দেওয়া আছে, (x - y)2 = 14
                  এবং xy = 2

∴ x+ y2 = (x - y)2 + 2xy
               = 14 + 2.2
               = 14 + 4
               = 18

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