x + y = 8 এবং x - y = 2, হলে, 2x2 + 2y2 কত?

A 64

B 72

C 70

D 68

Solution

Correct Answer: Option D

x + y = 8 
x - y = 2

2x2 + 2y2 = (x + y )2 + (x - y )2
               = 82 + 22
               = 64 + 4
               = 68

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