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If x∈Z and 1≤2x−1<9, what is the solution set?

Answer and explanation

Correct answer: {1,2,3,4}

The governing ideas are solving a compound linear inequality and then restricting the result to integers. Begin with 1≤2x−1<9. Add 1 to every part to get 2≤2x<10. Divide by positive 2, preserving both inequality signs: 1≤x<5. Over the real numbers this is an interval, but x is specified to belong to Z, the integers. The integers satisfying 1≤x<5 are 1, 2, 3, and 4, so the solution set is {1,2,3,4}, option A. Zero is too small, 5 is excluded by the strict upper bound, and option D omits the valid endpoint value 1. Hence A is correct.

Related tags

Integer-SetCompound-InequalitySolution-SetAlgebraic Solution Of Linear Inequalities In One VariableLinear InequalitiesMathematicsClass 11 Mcq

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