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A student says that on the number line, the point \(P=-\sqrt{15}\) lies between \(-3\) and \(-4\) and is closer to \(-4\). Which is the correct evaluation of the statement?

Answer and explanation

Correct answer: The statement is correct; \(P\) lies between \(-3\) and \(-4\) and is closer to \(-4\).

Since \(9<15<16\), we get \(3<\sqrt{15}<4\). Multiplying by \(-1\) reverses the order: \(-4<-\sqrt{15}<-3\). Also, \(\sqrt{15}\approx3.87\), so the point is nearer to \(-4\), not \(-3\). Exam tip: greater magnitude means farther left for negative numbers.

Related tags

Number LineIrrational NumbersSquare RootsNegative NumbersInequalitiesClass 9 MathematicsNumber SystemsMathematics

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