If a 2 + b 2 + c 2 + 84 = 4(a – 2b + 4c), then $$sqrt {ab – bc + ca} $$ is equa – OfficerPath

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MCQ Practice

If a 2 + b 2 + c 2 + 84 = 4(a - 2b + 4c), then $$sqrt {ab - bc + ca} $$ is equal to:

Subject: MathematicsTopic: Algebra

A

$$4sqrt {10} $$

B

$$sqrt {10} $$

C

$$5sqrt {10} $$

D

$$2sqrt {10} $$

Correct Answer: D

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