If a² + b² + c² + 170 = 2 (8a + 5b - 9c), then the value of $\rm \sqrt {4a + 8b -c}$ will be:

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If a² + b² + c² + 170 = 2 (8a + 5b - 9c), then the value of \(\rm \sqrt {4a + 8b -c}\) will be: