SSC CHSL 15 Nov 2015 Shift 2 Paper

Question : 133 of 200

Marks: +1, -0

If x=y=z, then

(x+y+z)^2/{x ^2+y^2 +z^2}

is:

Solution:

Given :

x = y = z

Let

x = y = z = k

To find :

(x+y+z)^2/{x ^2+y^2 +z ^2}

(k+k+k)^2/{k^2 +k^2 +k ^2}

{3k }^2/ (3k)^2

{9k}^ 2 /{3k}^2= 3

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