log\(2\sqrt 5 \) 400 = x হলে x এর মান কত ? 

A

B

C

D

Solution

Correct Answer: Option B

log\(2\sqrt 5 \) 400 = x  

বা, \((2\sqrt 5 )\) = 400 

বা,  \((2\sqrt 5 )\) = 16 \( \times \)25 

বা, \((2\sqrt 5 )\) =2 \( \times \)5 
বা, \((2\sqrt 5 )\) = 2\( \times \)\((\sqrt 5 )\)   
বা, \((2\sqrt 5 )\) = \((2\sqrt 5 )\)
বা, x = 4

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