Find the value of x square + 1 / x square if x - 1/x =root 3?
回答 (1)
2016-07-15 12:25 pm
x - (1/x) = √3
[x - (1/x)]² = (√3)²
x² - 2 x (1/x) + (1/x)² = 3
x² - 2 + (1/x²) = 3
x² + (1/x²) = 5
[x - (1/x)]² = (√3)²
x² - 2 x (1/x) + (1/x)² = 3
x² - 2 + (1/x²) = 3
x² + (1/x²) = 5
收錄日期: 2021-04-18 15:19:54
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