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If (a=3k) and (a^2=3b^2), what conclusion follows next?

Answer and explanation

Correct answer: \(b^2=3k^2\)

Substitute \(a=3k\) into \(a^2=3b^2\): \((3k)^2=3b^2\), so \(9k^2=3b^2\). Dividing both sides by 3 gives \(b^2=3k^2\). The option \(b^2=9k^2\) is incorrect because after division, the left side becomes \(3k^2\), not \(9k^2\). Exam tip: square the substituted value first, then simplify by dividing out common factors.

Related tags

Number SystemsIrrationality ProofSquare Root 3Algebraic SubstitutionProof By ContradictionProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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