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The length of a rectangle is ((x+3)) cm and breadth is (5) cm. If the perimeter is at most (30) cm, what is the solution for (x)?

Answer and explanation

Correct answer: \(-3<x\leq 7\)

The perimeter is \(2[(x+3)+5]\). Therefore, \(2x+16\leq30\), which gives \(2x\leq14\) and hence \(x\leq7\). Also, the length \(x+3\) must be positive, so \(x>-3\). Combining both conditions gives \(-3<x\leq7\). The option \(x\leq7\) satisfies only the perimeter condition and still includes values that give a non-positive length. Exam tip: after solving an inequality in a word problem, always check practical restrictions such as a length being positive.

Related tags

Linear InequalitiesRectangle PerimeterOne Variable InequalityAlgebraic Word ProblemsDomain RestrictionsAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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