x+y=5, x-y=3 হলে x2+y2এর মান কত?

A 17

B 18

C 20

D 22

Solution

Correct Answer: Option D

আমরা জানি,
  x2+y={(x+y)2+(x-y)2}/2
           =(52+32)/2
           =(25+9)/2
           =34/2
           =17

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