x + y = 8, x - y = 6 হলে x2 + y2 এর মান কত?

A 45

B 46

C 50

D 49

Solution

Correct Answer: Option C

আমরা জানি,
2(x²+y²)
= (x+y)²+(x-y)²
= 8²+ 6²
= 64+36
= 100

x²+y²= 100/2
         = 50

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