SSC CGL 16 Aug 2015 Shift 2 Paper

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Question : 147 of 200

Marks: +1, -0

If x +

1/x

= 1 then the value of

2/{x^2-x+2}

= ?

2
4
$2/3$
1

Solution:

x +

1/x

= 1
⇒

x^2

+ 1 = x ⇒

x^2

- x + 1 = 0
∴

2/{x^2-x+2}

=

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

=

2/{0+1}

= 2

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