a + b = \(\sqrt 3 \) এবং a - b = \(\sqrt 2 \) হলে 8ab (a + b) = ?  

A 12 

B 10 

C

D

Solution

Correct Answer: Option D

8ab (a + b ) 

= 4ab.2(a + b ) 

= { (a+b) - (a-b) } { (a+b) + (a-b) } 

= { (\(\sqrt 3 \) - (\(\sqrt 2 \) } {  (\(\sqrt 3 \) + (\(\sqrt 2 \) } 
=  (3-2) (3+2) = 5.1 = 5 

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