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What is obtained by simplifying \(\sqrt{45}\)?

Answer and explanation

Correct answer: \(3\sqrt{5}\)

\(45=9\times5=3^2\times5\). Therefore, \(\sqrt{45}=\sqrt{3^2\times5}=3\sqrt{5}\), so option A is correct. Option B results from incorrectly treating 45 as \(5^2\times3\), but \(5^2\times3=75\). Exam tip: factor the number into the largest perfect square multiplied by the remaining factor, then take the square root of the perfect square outside the radical.

Related tags

Real NumbersSurd SimplificationClass 9Number SystemsMathematicsClass 9 Mcq

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