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If \(x=\sqrt{a}\) and \(11.3<x<11.4\), which value of \(a\) is possible?

Answer and explanation

Correct answer: 128

Since \(x=\sqrt{a}\) and both bounds are positive, squaring preserves the inequality: \(11.3^2<a<11.4^2\), so \(127.69<a<129.96\). Among the given choices, only \(128\) lies in this interval; \(127\) is too small and \(131\) is too large. Exam tip: for a square-root inequality with positive bounds, square the boundary values to find the interval for the radicand.

Related tags

PolynomialsNumber LineSquare Root InequalitiesReal NumbersInequalitiesRepresenting Real Numbers On The Number LineMathematicsClass 10 Mcq

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