Powers and Roots Practice Test 1

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Question : 20 of 40

Marks: +1, -0

If

x =(7-4√3)

, then the value of

(x+1/x)

will be:

$14+8√3$
14
$8 √3$
$3√ 3$

Solution:

Given

x =(7-4√3)

Then

1/x=1/(7-4√3)=7+4√3

Now,

(x+1/x)

=7-4√3+7+4√3

=14

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