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What is the interval form of the inequality −4x − 1 < 11?

Answer and explanation

Correct answer: (−3, ∞)

From −4x − 1 < 11, we get −4x < 12. Dividing both sides by −4 reverses the inequality sign, giving x > −3. Since the inequality is strict, −3 is not included, so the interval is (−3, ∞). Exam tip: Always reverse the inequality sign when multiplying or dividing by a negative number.

Related tags

Linear InequalitiesInterval NotationNegative CoefficientStrict InequalityAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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