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A student claims that \(\sqrt{2}+\sqrt{8}=\sqrt{10}\) because the numbers inside square roots can be added when adding square roots. Which is the correct evaluation of this claim?

Answer and explanation

Correct answer: The claim is incorrect because \(\sqrt{2}+\sqrt{8}=3\sqrt{2}\), which is not equal to \(\sqrt{10}\).

Since \(\sqrt{8}=\sqrt{4\times2}=2\sqrt{2}\), we get \(\sqrt{2}+\sqrt{8}=\sqrt{2}+2\sqrt{2}=3\sqrt{2}\). This is not equal to \(\sqrt{10}\). The rule \(\sqrt{a}+\sqrt{b}=\sqrt{a+b}\) is not generally valid, so option D is incorrect. Exam tip: simplify square roots first and combine only like radical terms; do not add radicands directly.

Related tags

Real NumbersSquare RootsIrrational NumbersSurdsError AnalysisClass 9 MathematicsNumber SystemsMathematics

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