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If \(x=-5+\sqrt{22}\), in which interval does \(x\) lie on the number line?

Answer and explanation

Correct answer: Between −1 and 0

Since \(4^2<22<5^2\), we get \(4<\sqrt{22}<5\). Adding \(-5\) to all parts gives \(-1<-5+\sqrt{22}<0\). Therefore, \(x\) lies between \(-1\) and \(0\). Option B is incorrect because \(x\) is negative. Exam tip: To bound a square-root expression, first compare the radicand with the squares of consecutive integers.

Related tags

Number LineIrrational NumbersSquare RootIntervalsReal NumbersRepresenting Real Numbers On The Number LinePolynomialsMathematics

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