, మరియు 0  విలువను కనుగొనండి.

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SSC CGL 2023 Tier-I Official Paper (Held On: 17 Jul 2023 Shift 1)
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  1. 3√5
  2. 4√3
  3. -4√3
  4. -3√5

Answer (Detailed Solution Below)

Option 4 : -3√5
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SSC CGL Tier 1 2025 Full Test - 01
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Detailed Solution

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ఇచ్చిన సమస్య:

x2 + (1/x2) = 7

ఉపయోగించిన సూత్రం:

x2 + (1/x2) = P

అప్పుడు x + (1/x) = √(P + 2)

మరియు x - (1/x) = √(P - 2)

⇒ x2 - (1/x2) = {x + (1/x)} × {x - (1/x)}

సాధన:

x2 + (1/x2) = 7

⇒ x + (1/x) = √(7 + 2) = √9

⇒ x + (1/x) = 3

⇒ x - (1/x) = √(7 - 2)

⇒ x - (1/x) = - √5 {0

x2 - (1/x2) = {x + (1/x)} × {x - (1/x)}

⇒ 3 × (- √5)

∴ సరైన సమాధానం - 3√5.
 Mistake Point

గమనిక

0

కావున

1/x > 1

కావున

x + 1/x > 1

మరియు

x - 1/x 1 కావున, x - 1/x

కావున

(x - 1/x)(x + 1/x)

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