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If \(x\in\mathbb{R}\) and \(12<4x\leq 28\), which is the correct solution set for \(x\)?

Answer and explanation

Correct answer: \(3<x\leq 7\)

Dividing every part of \(12<4x\leq 28\) by the positive number \(4\) gives \(3<x\leq 7\). Since the divisor is positive, the inequality signs do not reverse. Option B incorrectly reverses the endpoint inclusions. Exam tip: reverse an inequality sign only when multiplying or dividing by a negative number.

Related tags

Compound-InequalityReal-NumbersSolution-SetInequality-RulesAlgebraic Solution Of Linear Inequalities In One VariableLinear InequalitiesMathematicsClass 11 Mcq

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