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What is obtained by simplifying \(\sqrt{245}\)?

Answer and explanation

Correct answer: \(7\sqrt{5}\)

\(245=49\times5=7^2\times5\). Therefore, \(\sqrt{245}=\sqrt{7^2\times5}=7\sqrt{5}\), so option B is correct. Option D is incorrect because the square root of the perfect-square factor \(49\) is \(7\), not \(49\). Exam tip: To simplify a radical, factor the radicand into the largest possible perfect square times the remaining factor.

Related tags

Real NumbersRadicalsSquare RootsSimplificationNumber SystemsMathematicsClass 9 Mcq

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