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Let \(a\) and \(b\) be rational numbers, \(b\ne0\), and let \(m\) be a natural number that is not a perfect square. What type of number is \(a+b\sqrt{m}\)?

Answer and explanation

Correct answer: Irrational number

Since \(m\) is not a perfect square, \(\sqrt{m}\) is irrational. A rational \(a+b\sqrt{m}\) would give \((a+b\sqrt{m}-a)/b=\sqrt{m}\) rational, a contradiction. Tip: check \(b\ne0\).

Related tags

Irrational NumbersNumber SystemsSurd PropertiesProof By ContradictionGrade 9 MathematicsMathematicsClass 9 Mcq

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