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Question
If x2 − 4x + 1 = 0, find `x+1/x`.
Sum
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Solution
x2 − 4x + 1 = 0
⇒ x2 + 1 = 4x
⇒ `(x^2 + 1)/x = 4`
⇒ `x + 1/x = 4`
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Chapter 3: Expansions - EXERCISE B [Page 36]
