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A student claims that √12 is irrational because √12 = 2√3. Which statement is needed to make this argument valid?

Answer and explanation

Correct answer: If √12 were rational, then dividing it by 2 would make √3 rational, which is impossible.

Since √12 = 2√3, assuming √12 rational gives √3 = √12 ÷ 2 as rational. This contradicts the known irrationality of √3, so √12 is irrational. Exam tip: A non-zero rational multiple of an irrational number is irrational.

Related tags

Number SystemsIrrational NumbersSquare RootsProof By ContradictionClass 9 MathematicsProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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