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Which interval form represents the solution of 4x − 8 ≤ 0?

Answer and explanation

Correct answer: (−∞, 2]

The governing concept is converting an algebraic inequality into interval notation while correctly treating its boundary. Starting with 4x − 8 ≤ 0, add 8 to both sides to obtain 4x ≤ 8. Divide by the positive number 4, giving x ≤ 2. Numbers less than 2 and the number 2 itself are included, while numbers greater than 2 are excluded. Therefore the interval is (−∞, 2], which is option A. The square bracket at 2 records inclusion because the relation is ≤. Option B wrongly excludes 2, and C and D describe values to the right of 2 rather than to its left. Infinity always uses a parenthesis, never a square bracket.

Related tags

Linear InequalitiesInterval NotationBoundary PointAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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