x+y=7 এবং xy=15 হলে x²+y² এর এর মান কত ?

A 19

B 14

C 21

D 30

Solution

Correct Answer: Option A

দেওয়া আছে ,
        x+y=7
  এবং xy=15
অতএব , x²+y²=(x+y)²-2xy
                       =(7)²-2.15
                       =49-30
                       =19

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