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What is obtained by simplifying √980?

Answer and explanation

Correct answer: 14√5

The governing concept is simplifying a radical by taking the largest convenient perfect-square factor outside the square root. Since 980 = 196 × 5 and 196 = 14², we have √980 = √(196 × 5) = √196 × √5 = 14√5. Thus option A is correct. Option B, 7√20, is numerically equal to the original expression, but it is not in simplest surd form because √20 = √(4 × 5) = 2√5, so 7√20 becomes 14√5. Option C is incorrect because its square is 28² × 5 = 3920. Option D has both an incorrect coefficient and radicand. Squaring option A gives 14² × 5 = 196 × 5 = 980, which verifies the result.

Related tags

Real NumbersRadicalsSurd SimplificationSquare RootsSquares And Square RootsCommon QuestionsCommonMathematics

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