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What is the solution of the compound inequality 3x−8 < 2x+1 ≤ 5x−11?

Answer and explanation

Correct answer: 4≤x<9

A compound inequality means that both component inequalities must hold simultaneously. First solve 3x−8<2x+1. Subtract 2x and add 8 to obtain x<9. Next solve 2x+1≤5x−11. Add 11, subtract 2x, and divide by 3: 12≤3x, so x≥4. The required solution is the intersection of x<9 and x≥4, namely 4≤x<9. Therefore option B is correct. The lower endpoint 4 is included because the second relation is ≤, while the upper endpoint 9 is excluded because the first relation is strict. Option A omits valid values from 4 onward, option C omits the valid interval, and option D incorrectly excludes 4 and includes 9.

Related tags

Compound InequalityIntersection Of Solution SetsLinear InequalitiesClass 11Algebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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