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What is the solution of (5(x-1)-2(3x+4)<9)?

Answer and explanation

Correct answer: \(x>-22\)

On simplifying, \(5x-5-6x-8<9\) becomes \(-x-13<9\). Adding 13 to both sides gives \(-x<22\). Multiplying by \(-1\) reverses the inequality sign, so \(x>-22\). The option \(x<-22\) results from forgetting to reverse the sign when multiplying by a negative number. Exam tip: always reverse an inequality sign when multiplying or dividing by a negative quantity.

Related tags

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

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