Question

if x square+1/x square=81 find the value of (x - 1/x)

Answer 1

Answer:

±√79

Step-by-step explanation:

x square+1/x square = 81

x² + 1/x² = 81

x² + 1/x² - 2 = 79

(x - 1/x)² = 79

(x - 1/x) = ±√79