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If \(x\in(0,2)\), in which interval does \(x^2\) lie?

Answer and explanation

Correct answer: \(x^2\in(0,4)\)

Since \(0<x<2\), and the square function is increasing throughout this positive interval, we get \(0^2<x^2<2^2\), or \(0<x^2<4\). Therefore, the correct interval is \((0,4)\). Option B is incorrect because \(x\) cannot equal either 0 or 2, so neither endpoint is included. Exam tip: after transforming an interval, always check whether its endpoints are open or closed.

Related tags

Linear InequalitiesInterval NotationSquare FunctionOpen IntervalsRepresentation On Number LineMathematicsClass 11 Mcq

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