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Which is the correct solution of (-2(5-x)+3(x-4)>6x+1)?

Answer and explanation

Correct answer: \(x<-23\)

Simplifying the left-hand side gives \(-2(5-x)+3(x-4)=-10+2x+3x-12=5x-22\). Thus, \(5x-22>6x+1\), so \(-x>23\). On multiplying both sides by \(-1\), the inequality sign reverses, giving \(x<-23\). \(x\le -23\) is incorrect because the original inequality is strict, \(>\). Exam tip: always reverse an inequality sign when multiplying or dividing by a negative number.

Related tags

Linear InequalitiesOne VariableAlgebraic SimplificationInequality ReversalClass 11Algebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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