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A student simplifies \\(\sqrt{50}\\) as \\(5\sqrt{2}\\) and calls it an irrational number. Which evaluation of the student's conclusion is correct?

Answer and explanation

Correct answer: \\(\sqrt{50}=5\sqrt{2}\\), इसलिए यह अपरिमेय संख्या है।

Since \\(50=25\times2\\), we get \\(\sqrt{50}=\sqrt{25\times2}=5\sqrt{2}\\). Because \\(\sqrt{2}\\) is irrational, multiplying it by the non-zero rational number 5 still gives an irrational number. Therefore, option A is correct. Option C has the correct simplification but incorrectly classifies the result as rational. Exam tip: take perfect-square factors outside the square root and check whether a non-perfect-square factor remains inside.

Related tags

Real NumbersIrrational NumbersSquare RootsNumber SystemsClass 9 MathematicsMathematicsClass 9 Mcq

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