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Choose the solution set of the inequality \(5(x+2)-3\leq 2x+16\).

Answer and explanation

Correct answer: \(x\leq 3\)

Expanding the brackets gives \(5x+10-3\leq 2x+16\), or \(5x+7\leq 2x+16\). Subtracting \(2x\) from both sides yields \(3x\leq 9\). Dividing by the positive number \(3\) gives \(x\leq 3\), so option A is correct. Option B incorrectly reverses the inequality sign; the sign changes only when multiplying or dividing by a negative number. Exam tip: always check whether the number used to divide an inequality is positive or negative.

Related tags

Linear-InequalitiesAlgebraic-SimplificationInequality-SignsBracketsAlgebraic Solution Of Linear Inequalities In One VariableLinear InequalitiesMathematicsClass 11 Mcq

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