Question

Answer it
Wrong answers will be reported​

Answer 1

Answer:

B} +-4

Step-by-step explanation:

= {x-1/x}^2 = x^2+1/x^2-2

= Given =18

=18-2

= {x-1/x}^2= 16

=

x-1/x =√16= = +-4

Dude, your Answer is here

Answer 2

Given :-

x²+1/x² = 18

Now, subtracting 2.x.1/x from both sides.

=> x²+1/x² - 2.x.1/x = 18-2.x.1/x

As we know that a²+b²-2ab = (a-b)²

(x-1/x)² = 16

x-1/x = √16

x-1/x = $\pm4$

Hence, Option B is right.