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What is the solution of -6 ≤ 3x < 12?

Answer and explanation

Correct answer: -2 ≤ x < 4

The governing concept is solving a compound inequality by applying the same operation to all three parts. Starting with -6 ≤ 3x < 12, divide the entire chain by 3. Since 3 is positive, the directions of both inequality signs remain unchanged: -6/3 ≤ x < 12/3. Therefore -2 ≤ x < 4, which is option A. The left endpoint -2 is included because the left sign is ≤, while the right endpoint 4 is excluded because the right sign is <. Option B reverses the endpoint inclusion, option C excludes both endpoints, and option D incorrectly includes the upper endpoint. Testing the boundaries confirms the result: x = -2 works, but x = 4 does not.

Related tags

Compound InequalityInterval NotationPositive DivisionEndpointsAlgebraic Solution Of Linear Inequalities In One VariableLinear InequalitiesMathematicsClass 11 Mcq

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