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What is the simplest form of \(\sqrt{72}\)?

Answer and explanation

Correct answer: \(6\sqrt{2}\)

Since \(72=36\times2\) and \(36\) is a perfect square, \(\sqrt{72}=\sqrt{36\times2}=\sqrt{36}\times\sqrt{2}=6\sqrt{2}\). Therefore, option B is correct. The coefficients in options A and D are incorrect, while option C does not square to \(72\). Exam tip: factor the number using the largest perfect-square factor before simplifying a square root.

Related tags

Real NumbersSurd SimplificationPerfect Square FactorsNumber SystemsMathematicsClass 9 Mcq

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