Question

Help me pls help ..........

Answer 1

Answer:

4

Step-by-step explanation:

(x)^2+(1/x)^2=18

(x-1/x)^2+2x.1/x=18

(x-1/x)^2+2=18

(x-1/x)^2=16

(x-1/x)^2=4^2

x-1/x=4