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    (√5+√3) (√5-√3) =

A    5

B    2

C    3

D    3/5

Solution

Correct Answer: Option B

 

এটি একটি বহুল ব্যবহৃত সূত্র। a2-b2= (a+b)(a-b)

(√5+√3) (√5-√3)

= (√5)2- (√3)2

= 5 - 3

= 2

কোন সংখ্যার রুটের উপর স্কয়ার থাকলে শুধুমাত্র সংখ্যাটি থাকবে।  

 

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