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If \(p=2-\sqrt{45}\), in which of the following intervals does \(p\) lie on the number line?

Answer and explanation

Correct answer: Between \(-5\) and \(-4\)

Since \(6<\sqrt{45}<7\), multiplying by \(-1\) reverses the inequalities: \(-7< -\sqrt{45}< -6\). Adding 2 throughout gives \(-5<p<-4\). Therefore, \(p\) lies between \(-5\) and \(-4\). Option B is incorrect because \(p\) is less than \(-4\). Exam tip: Compare a square root with neighbouring perfect squares instead of calculating its decimal value.

Related tags

Number LinePolynomialsIrrational NumbersInequality EstimationRepresenting Real Numbers On The Number LineMathematicsClass 10 Mcq

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