If a2 + b2 + c2 + 84 = 4(a - 2b + 4c), then \(\sqrt {ab - bc + ca} \) – McqOptions

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1.	If a2 + b2 + c2 + 84 = 4(a - 2b + 4c), then \(\sqrt {ab - bc + ca} \) is equal to:
A.	\(4\sqrt {10} \)
B.	\(5\sqrt {10} \)
C.	\(2\sqrt {10} \)
D.	\(\sqrt {10} \)
Answer» D. \(\sqrt {10} \)

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