SSC CGL 4 Sep 2016 Paper

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Question : 59 of 100

Marks: +1, -0

If x +

1/x

= 5 , then the value of

x/{1+x+x^2}

is

$1/5$
$1/6$
5
6

Solution:

x +

1/x

= 5 (Given)
∴

x/{1+x+x^2}

=

x/{x(1/x+1+x)}

=

1/{x+1/x+1}

=

1/{5+1}

=

1/6

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