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What is the value of \(\sqrt{50}-\sqrt{8}\)?

Answer and explanation

Correct answer: \(3\sqrt{2}\)

\(\sqrt{50}=\sqrt{25\times2}=5\sqrt{2}\) and \(\sqrt{8}=\sqrt{4\times2}=2\sqrt{2}\). Therefore, \(\sqrt{50}-\sqrt{8}=5\sqrt{2}-2\sqrt{2}=3\sqrt{2}\), so option C is correct. \(\sqrt{42}\) is incorrect because the difference of square roots is not generally equal to \(\sqrt{50-8}\). Exam tip: simplify each surd by factoring out its greatest perfect-square factor first.

Related tags

SurdsReal NumbersSquare RootsRadicalsSimplifying SurdsNumber SystemsMathematicsClass 9 Mcq

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