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Which option is the simplified form of √12?

Answer and explanation

Correct answer: 2√3

The governing concept is extraction of perfect-square factors from a square root. Rewrite 12 as 4 × 3, where 4 is a perfect square. Then √12 = √(4 × 3) = √4 × √3 = 2√3. The factor 3 remains under the radical because it has no perfect-square factor other than 1, so 2√3 is fully simplified. Option B, 3√2, squares to 18 and therefore represents √18, not √12. Option C is incorrect because 6² = 36, and option D squares to 48, which is too large. Squaring the selected expression gives (2√3)² = 4 × 3 = 12, providing a direct check that option A is the only correct answer.

Related tags

Square RootsRadical SimplificationIrrational NumbersNumber SystemsIrrational NumbersNumber SystemsMathematicsClass 9 Mcq

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