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If \(\sqrt{n}\) lies between \(7.2\) and \(7.3\) on the number line, which value of \(n\) is possible?

Answer and explanation

Correct answer: \(52\)

Since \(7.2<\sqrt{n}<7.3\) and both boundary values are positive, squaring gives \(7.2^2<n<7.3^2\). Thus, \(51.84<n<53.29\). Only \(52\) lies in this interval; \(51\) and \(50\) are too small, while \(54\) is too large. Exam tip: when both sides of an inequality are positive, squaring preserves its direction.

Related tags

Number LineSquare RootsInequalitiesEstimationRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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