x + y = 8 এবং x - y = 2, হলে, 2x2 + 2y2 কত?
Solution
Correct Answer: Option D
x + y = 8
x - y = 2
2x2 + 2y2 = (x + y )2 + (x - y )2
= 82 + 22
= 64 + 4
= 68
x - y = 2
2x2 + 2y2 = (x + y )2 + (x - y )2
= 82 + 22
= 64 + 4
= 68
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