a+b = 12 এবং a-b=4 হলে 2a2+2b2 = কত?

A ৯৬

B ১২০

C ১৬০

D ২৪০

Solution

Correct Answer: Option C

আমরা জানি,

2(a2+ b2) = (a + b)2 + (a-b)2

⇒2a²+2b²=12² +4²

= 144 +16

= 160

 

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