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If x ∈ ℝ and x + 3 ≥ 10, what is the correct solution for x?

Answer and explanation

Correct answer: x ≥ 7

The governing rule is that adding or subtracting the same number from both sides of an inequality preserves the inequality sign. Starting with x + 3 ≥ 10, subtract 3 from both sides: x + 3 − 3 ≥ 10 − 3. Hence x ≥ 7. The endpoint 7 is included because the original relation uses ≥; indeed, x = 7 gives 7 + 3 = 10, which satisfies the condition. Values greater than 7 also work, while values below 7 do not. Option A is therefore correct. Option B reverses the direction incorrectly, option C wrongly excludes the valid endpoint 7, and option D gives the opposite solution set.

Related tags

Linear-InequalitiesAlgebraic-SolutionOne-VariableReal-NumbersAlgebraic Solution Of Linear Inequalities In One VariableLinear InequalitiesMathematicsClass 11 Mcq

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