Question:`a^2 - b^2 = 4` এবং ab = 2  হলে, `a^2 + b^2` এর মান কত? 

A `6 sqrt 2` 
B `8 sqrt 2` 
C `4 sqrt 2` 
D `2 sqrt 6` 

+ Answer
C 

+ Explanation
`a^2 + b^2 = sqrt (( a^2 - b^2 )^2 + 4 a^2 b^2)`
                  `= sqrt (16 + 4.4)`
                  `= sqrt 32 = 4 sqrt 2`

[ ন. প্র. রা. বো.  ন. প্র. ব. বো.]

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Zinia Islam

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