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What is the solution set of the inequality 5(x - 1) + 2 < 5x?

Answer and explanation

Correct answer: All x ∈ ℝ

The governing method is to expand, collect like terms, and determine the truth of the resulting statement. Starting with 5(x − 1) + 2 < 5x, expansion gives 5x − 5 + 2 < 5x, or 5x − 3 < 5x. Subtracting 5x from both sides leaves −3 < 0. This is a true numerical statement and places no restriction on x. Consequently, every real number satisfies the original inequality, so the solution set is ℝ. Option B would be correct only if simplification produced a contradiction such as −3 > 0. Options C and D incorrectly restrict the answer to one value or to positive values. Therefore option A is correct.

Related tags

Linear InequalitiesSolution SetAlgebraic SimplificationAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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