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What is the simplified form of (\sqrt{320})?

Answer and explanation

Correct answer: \(8\sqrt{5}\)

\(320=64\times 5\), and \(64\) is the greatest perfect-square factor. Therefore, \(\sqrt{320}=\sqrt{64\times5}=\sqrt{64}\sqrt{5}=8\sqrt{5}\). In option A, \(\sqrt{20}\) can be simplified further, so it is not in simplest form. Exam tip: To simplify a square root, identify the greatest perfect-square factor of the number.

Related tags

Real NumbersSquare RootsSurdsRadical SimplificationNumber SystemsMathematicsClass 9 Mcq

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