UPSC CDS 2 2021 Math Paper

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Question : 70 of 100

Marks: +1, -0

If ‌

x

b+c−a

=‌

y

b−c−a

=‌

z

a+b−c

=k then what is x2+y2+z2−2xy−2yz+2zx equal to ?

k2(a2+b2+c2)
k2(a2−b2+c2)
k2(a+b+c)2
k2(a−b+c)2

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