125 (√5)2x = 1 হলে, x এর মান কত?

A ৩3

B -3

C 7

D 9

Solution

Correct Answer: Option B

125 (√5)2x = 1
⇒ (√5)2x = 1/125
⇒ 5(1/2×2x) = 1/125
⇒ 5x = 1/(53)
⇒ 5x = (5)-3
∴ x = -3

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