Find the value of x; [1 - {√(1 - x)}]/[1 + {√(1 - x)}] = 1/3

A 1/4

B 1/2

C 3/4

D 3/3

Solution

Correct Answer: Option C

[1 - √(1 - x)]/[1 + √(1 - x)] = 1/3
⇒ (1 - t)/(1 + t) = 1/3 [√(1 - x) = t ধরে]
⇒ 3(1 - t) = 1(1 + t)
⇒ 3 - 3t = 1 + t
⇒ 3 - 1 = t + 3t
⇒ 2 = 4t
⇒ t = 1/2
⇒ √(1 - x) = 1/2
⇒ 1 - x = (1/2)²
⇒ 1 - x = 1/4
⇒ x = 1 - 1/4
⇒ x = 3/4

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