Answers

  • Brainly User
2014-11-29T12:41:58+05:30
X + 1/x = 12 

Squaring both sides: 

x^2 + 2 + 1/x^2 = 144 => x^2 + 1/x^2 = 142 

Squaring both sides of (x - 1/x) => x^2 + 1/x^2 - 2 = 140 = (x - 1/x)^2 

Therefore x - 1/x = √140
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