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प्रश्न
If `x^2 + 1 = 2x`, then find `x - (1/x)`
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उत्तर
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Explanation:
`x^2 + 1 = 2x`
⇒ `x^2 - 2x + 1` = 0
⇒ `x^2 - x - x + 1` = 0
⇒ `x(x - 1) + 1(x - 1)` = 0
⇒ `(x - 1)(x + 1)` = 0
So, `x = 1, -1`
Putting `x = 1`
`x - 1/x = 1 - 1/1 = 1 - 1` = 0
Putting `x = (-1)`
`x - 1/x = (-1) - 1/(-1) = - 1 + 1` = 0
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Algebraic Identities and Polynomials (Entrance Exam)
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