If x = √2 - 1, then write the value of x - 1/x
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x = √2 - 1
∴ x - 1/x
(√2 - 1 ) - 1/(√2 - 1)
[(√2 - 1)² - 1 ] / (√2 - 1)
(4 + 1 - 2√2 - 1) / (√2 - 1)
(4 - 2√2) / (√2 - 1)
2(√2 - 1) / (√2 - 1) = 2
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