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Class 9MathematicsIntroduction to PolynomialsAlgebraic expressionsMedium
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If the length of a rectangle is (x+4) and breadth is (x-1), what is the expression for its perimeter?

Answer and explanation

Correct answer: (4x+6)

The perimeter of a rectangle is 2(length + breadth). So, 2[(x+4)+(x-1)] = 2(2x+3) = (4x+6). Therefore, option B is correct. (2x+3) is only the sum of the length and breadth, not the perimeter. Exam tip: Do not forget to multiply by 2 when finding a rectangle’s perimeter.

Related tags

Algebraic ExpressionsRectangle PerimeterPolynomialsLinear ExpressionsClass 9 MathematicsIntroduction To PolynomialsMathematicsClass 9 Mcq
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