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The length of a rectangular room is 14 m more than its breadth. If the area of the room is 480 square metres, what is its breadth?

Answer and explanation

Correct answer: 16 m

Let the breadth be x metres. Then the length is (x + 14) metres. Using area = length × breadth, we get x(x + 14) = 480, or x² + 14x − 480 = 0. Factoring gives (x − 16)(x + 30) = 0, so x = 16 or x = −30. Since a length cannot be negative, the breadth is 16 m. Exam tip: In rectangle word problems, first use area = length × breadth and reject any negative dimension.

Related tags

Quadratic EquationsRectanglesWord ProblemsAreaPolynomialsWord Problems And ApplicationsMathematicsClass 10 Mcq

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