ఒకవేళ x + y = 18 మరియు xy = 9 అయితే, \(\rm \left(\frac{x}{y}+\frac{y}{x}\right)\) విలువ:

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SSC Selection Post 2024 (Graduate Level) Official Paper (Held On: 25 Jun, 2024 Shift 3)
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  1. 32
  2. 38
  3. 34
  4. 36

Answer (Detailed Solution Below)

Option 3 : 34
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ఇవ్వబడింది:

x + y = 18 మరియు xy = 9

ఉపయోగించిన సూత్రం:

\(\dfrac{x}{y} + \dfrac{y}{x} = \dfrac{x^2 + y^2}{xy}\)

గణన:

మనకు తెలుసు, \((x + y)^2 = x^2 + y^2 + 2xy\)

ఇవ్వబడింది: x + y = 18 మరియు xy = 9

\((18)^2 = x^2 + y^2 + 2 \times 9\)

\(324 = x^2 + y^2 + 18\)

\(x^2 + y^2 = 324 - 18\)

\(x^2 + y^2 = 306\)

\(\dfrac{x^2 + y^2}{xy} = \dfrac{306}{9}\)

\(\dfrac{306}{9} = 34\)

కాబట్టి, సరైన సమాధానం 3వ ఎంపిక.

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