(a – 3)2 + (b – 4)2 + (c – 9)2 = 0⇒ a – 3 = 0 ⇒ a = 3b – 4 = 0 ⇒ b = 4and c – 9 = 0 ⇒ c = 9∴ √a + b + c = √3 + 4 + 9= √16 = ± 4
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