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What is the solution of (9x-4(2x+1)>3x+8)?

Answer and explanation

Correct answer: \(x<-6\)

Given \(9x-4(2x+1)>3x+8\), expanding the bracket gives \(9x-8x-4>3x+8\), or \(x-4>3x+8\). Subtracting \(3x\) from both sides gives \(-2x-4>8\), so \(-2x>12\). On dividing by \(-2\), the inequality sign reverses, giving \(x<-6\). The close distractor \(x>-6\) results from forgetting to reverse the sign when dividing by a negative number. Exam tip: always reverse an inequality sign when multiplying or dividing both sides by a negative quantity.

Related tags

Linear InequalitiesClass 11One VariableAlgebraic SolutionInequality Sign ReversalAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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