a+b = √3 and a-b=√2 হলে 8ab(a2 + b2)=?
Solution
Correct Answer: Option D
8ab (a2 + b2 )
= 4ab.2(a2 + b2 )
= { (a+b)2 - (a-b)2 } { (a+b)2 + (a-b)2 }
= { (\(\sqrt 3 \)2 - (\(\sqrt 2 \)2 } { (\(\sqrt 3 \)2 + (\(\sqrt 2 \)2 }
= (3-2) (3+2) = 5.1 = 5
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