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A rectangle has length (4x-7) and breadth (3x+2). What is the expression for its perimeter?

Answer and explanation

Correct answer: \(14x-10\)

The perimeter of a rectangle is \(2(\text{length}+\text{breadth})\). Thus, \(2[(4x-7)+(3x+2)] = 2(7x-5) = 14x-10\). Therefore, the correct expression is \(14x-10\). The expression \(7x-5\) is only the sum of the length and breadth, not the perimeter. Exam tip: A rectangle has two equal lengths and two equal breadths, so multiply \(l+b\) by 2.

Related tags

Algebraic ExpressionsRectangle PerimeterPolynomialsLinear ExpressionsPerimeter FormulaIntroduction To PolynomialsMathematicsClass 9 Mcq

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