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If \(-\sqrt{m}\) lies between \(-3\) and \(-2\) on the number line, which value of \(m\) could be correct?

Answer and explanation

Correct answer: 5

We have \(-3< -\sqrt{m}< -2\). Multiplying all parts by \(-1\) reverses the inequality signs, giving \(2<\sqrt{m}<3\). Since both sides are positive, squaring yields \(4<m<9\). Among the given choices, only \(5\) lies in this interval. For instance, \(3\) gives \(\sqrt{m}<2\), while \(10\) gives \(\sqrt{m}>3\), so they are not possible. Exam tip: reverse the inequality sign whenever you multiply or divide by a negative number.

Related tags

Number LineNegative Square RootInequalitiesPolynomialsRepresenting Real Numbers On The Number LineMathematicsClass 10 Mcq

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