SSC CPO SI and ASI Model Paper 9

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Question : 128 of 200

Marks: +1, -0

If

x+1/ x =6

, then what is the value of

x- 1 /x ?

$2 √4$
2
$4 √2$
4

Solution:

x +1/x= 6

Squaring both sides, we get

⇒x^2+1/x^2=34

Now,

x^ 2+1/x^2-2(x)(1/x ) =34 -2

⇒[x-1/ x]^2=32

⇒

x+1/x=√ 32=4√2

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