125(√5)2x = 1 হলে x এর মান কত?

A 3

B - 3

C 7

D 9

Solution

Correct Answer: Option B

 125(√5)2x = 1 
বা, 53.(51/2)2x = 1
বা, 53 . 5x = 1
বা, 53 + x = 50
বা, 3 + x = 0
বা, x = - 3

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