Sainik School Entrance Exam 2018 Solved Paper

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Question : 26 of 150

Marks: +1, -0

If

x+1/x = 5

then

x^2+1/x^2 =?

25
27
23
$25 1/25$

Solution:

(c)

=x^2+{1}/{x^2}=(x+{1}/{x})^2-2 x {1}/{x}

=(5)^2-2=25-2=23

.
So, the value of

x^2+{1}/{x^2}=23

.

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