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What is the integer solution set of (-3 ≤ 2x + 1 < 7)?

Answer and explanation

Correct answer: {-2, -1, 0, 1, 2}

A compound inequality must be transformed on all three parts at the same time. Begin with -3 ≤ 2x + 1 < 7. Subtract 1 throughout to get -4 ≤ 2x < 6. Divide every part by the positive number 2; the inequality signs remain unchanged, giving -2 ≤ x < 3. The real-number solution is the interval from -2 inclusive to 3 exclusive. Restricting this interval to integers gives -2, -1, 0, 1, and 2, so option A is correct. The value 3 is excluded because the right inequality is strict, and -2 is included because the left inequality uses ≤. Option B omits -2 and includes 3, option C incorrectly includes 3, and option D incorrectly includes -3.

Related tags

Compound-InequalityInteger-SolutionsIntervalAlgebraic Solution Of Linear Inequalities In One VariableLinear InequalitiesMathematicsClass 11 Mcq

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