1.

X square minus one upon x square ​

Answer»

Step-by-step explanation:

x² + 1/x² = 27

x² + 1/x² - 2 = 27 - 2

x² + 1/x² - 2 × X × 1/x = 25

( x - 1/x )² = 5²

x - 1/x = ± 5



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