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Which is the correct solution of (7-(3x+2)\ge 2x-10)?

Answer and explanation

Correct answer: \(x \le 3\)

Given \(7-(3x+2)\ge 2x-10\), opening the bracket gives \(7-3x-2\ge 2x-10\), or \(5-3x\ge 2x-10\). Adding \(3x\) and \(10\) to both sides gives \(15\ge 5x\). Since 5 is positive, dividing by 5 does not reverse the inequality sign, so \(x\le 3\). The closest distractor, \(x<3\), is incorrect because \(x=3\) also satisfies the inequality. Exam tip: reverse an inequality only when multiplying or dividing by a negative number.

Related tags

Linear InequalitiesOne VariableAlgebraic SolutionInequality SignsBracketsClass 11Algebraic Solution Of Linear Inequalities In One VariableMathematics

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