Question

Find the value of x – 1/x, If x^2 + 1/x^2 = 18.

. If x + 1/x = 7, then find the value of x^3 + 1/x^3​

Answer 1

Answer:

x - 1/x = 4

Step-by-step explanation:

FInd the value of x - 1/x

x² + 1/x² = 18

(x - 1/x)² = (x)² + (1/x)² - 2(x)(1/x)

(x - 1/x)²= x² + 1/x² - 2

(x - 1/x)²= 18 - 2

(x - 1/x)²= 16

x - 1/x = √16

x - 1/x = 4