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The length of a rectangular garden is 5 m more than its breadth. If the area of the garden is 336 square metres, what is its breadth?

Answer and explanation

Correct answer: 16 m

Let the breadth be \(x\) m. Then the length is \(x+5\) m, so \(x(x+5)=336\), giving \(x^2+5x-336=0\). Factoring, \((x+21)(x-16)=0\), so \(x=16\) or \(x=-21\). Since a breadth cannot be negative, the correct answer is 16 m. Exam tip: reject any negative root when the variable represents a physical length.

Related tags

Quadratic EquationsWord ProblemsRectangular GardenAreaFactorisationWord Problems And ApplicationsMathematicsClass 10 Mcq

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