SSC CPO SI and ASI Model Paper 7

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Question : 116 of 200

Marks: +1, -0

Find the value of the question mark (?) in the following expression:

{4+√5}/{4-√5}+{4-√5}/{4+√5}

=?

$-47/ 11$
$- 42 /11$
$43 /11$
$42/ 11$

Solution:

(4)

{(4+√5)^2+(4-√5)^2}/{(4-√5)(4+√5)}=?

⇒

{2{(4)^2+(√5)^2}}/{(4)^2-(√5)^2}=?

⇒{2(16+5)}/{16-5}=?

⇒?=42/11

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