Question

if x=root2-1 what is the value of x-1/x

Answer 1

Answer:

Step-by-step explanation:

See the screenshot below

Answer 2

Answer:

-2

Step-by-step explanation:

x = √2 - 1

1/x = 1/(√2-1)  × (√2+1)/(√2+1)

     = (√2+1) / 1

So, 1/x = √2 + 1

∴x - 1/x = √2 - 1 - (√2 + 1)

            = -2