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Solve the compound inequality (4\le 2x+6<14).

Answer and explanation

Correct answer: \(-1\le x<4\)

Subtract 6 from all three parts of the compound inequality to get \(-2\le 2x<8\). Dividing every part by the positive number 2 does not reverse the inequality signs, giving \(-1\le x<4\). Thus, \(-1\) is included but \(4\) is excluded. Option B incorrectly excludes \(-1\). Exam tip: inequality signs remain unchanged when dividing by a positive number, but reverse when dividing by a negative number.

Related tags

Linear InequalitiesCompound InequalityOne VariableInterval NotationClass 11 AlgebraAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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