Indian Institute of Foreign Trade 2011 Solved Paper

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Question : 43 of 120

Marks: +1, -0

if

x/y=7/4

,find the value o

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

$27/49$
$43/72$
$33/65$
None of the abve

Solution:

Given that If

x/y=7/4

Therefore,

(x/y)^2=49/16

.....(1)

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

this can be written as,

⇒{(x/y)^2-1}/{(x/y)^2+1}

⇒{49/16-1}/{49/16+1}

⇒{49-16}/{49+16}

⇒33/65

Hence, option C is the correct answer.

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