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A rectangle's length is 6 units more than its breadth and its area is 72 square units. If the breadth is x, what is the equation?

Answer and explanation

Correct answer: \(x^2+6x-72=0\)

Length = breadth + 6, so length = \(x+6\). Area = breadth × length = \(x(x+6)=72\). Rearranging gives \(x^2+6x-72=0\), so option A is correct. The closest distractor B has the sign of the linear term wrong (\(-6x\) instead of \(+6x\)); C and D have incorrect coefficients/term placement. Exam tip: assign variables to dimensions, form the area equation, then bring all terms to one side to obtain a standard quadratic for solving.

Related tags

Quadratic-EquationsAreaWord-ProblemForming-EquationsFactoringIntroduction To Quadratic EquationsQuadratic EquationsMathematics

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