Question

if x is 3+root8 find x-1/x
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Answer 1

Ans:- x = 3 + √8

then, 1/x = 1/3 + √8 = 3 - √8 / 3 - √8

= 3 - √8

Now,

x - 1/x = 3 + √8 - (3 - √8)

x - 1/x = 3 + √8 - 3 + √8

x - 1/x = 2√8

here is your answer

hope it will help you

Answer 2

Answer:

2√8

Step-by-step explanation:

x= 3+√8

1/x=1/3+√8

on rationalising

1/x = 3-√8

x-1/x=3+√8-(3-√8)

=3+√8-3+√8

= 2√8