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What is the simplified surd form of \(\sqrt{125}\)?

Answer and explanation

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

Since \(125=25\times5\) and \(25\) is a perfect square, \(\sqrt{125}=\sqrt{25\times5}=5\sqrt{5}\). Therefore, option A is correct. Option B has an extra factor of \(5\), while option C is not the simplified form and equals \(25\). Exam tip: factor the radicand using its largest perfect-square factor before simplifying the square root.

Related tags

Real NumbersSurdsSquare RootsRadical SimplificationNumber SystemsMathematicsClass 9 Mcq

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