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What is obtained by simplifying (√147)?

Answer and explanation

Correct answer: 7√3

To simplify a square root, factor the radicand into the largest possible perfect-square factor and the remaining factor. Here 147 = 49 × 3 = 7² × 3. Therefore √147 = √(49 × 3) = √49 × √3 = 7√3. Thus option B is correct. Option C corresponds to √63 rather than √147, while option A incorrectly uses 21 as the coefficient and option D treats 49 itself as the coefficient after taking a square root. The simplified form should have no square factor remaining under the radical; since 3 has no perfect-square factor greater than 1, 7√3 is fully simplified.

Related tags

Real NumbersRadicalsSquare RootsNumber SystemsMathematicsClass 9 Mcq

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