If x = b c, y = c a, z = a b, thenx2+ y2+ z2 - 2xy - 2xz+ 2yz is equal – McqOptions

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1.	If x = b c, y = c a, z = a b, thenx2+ y2+ z2 - 2xy - 2xz+ 2yz is equal to
A.	a + b + c
B.	abc
C.	4b^2
D.	a^2 + b^2
Answer» D. a^2 + b^2

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