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Find the solution set of (4x-9\ge 2(1-x)+15).

Answer and explanation

Correct answer: \(x \ge \frac{13}{3}\)

Simplifying the right-hand side gives \(2(1-x)+15=17-2x\). Thus, \(4x-9\ge 17-2x\), so \(6x\ge 26\) and hence \(x\ge \frac{13}{3}\). The option \(x>\frac{13}{3}\) is incorrect because \(x=\frac{13}{3}\) also satisfies the inequality. Exam tip: Reverse an inequality sign only when multiplying or dividing by a negative number.

Related tags

Linear InequalitiesOne VariableAlgebraic SolutionSolution SetClass 11 MathematicsAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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