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In a rectangle model, length is (x+5) and breadth is (x+2). What will be the total of the x-terms?

Answer and explanation

Correct answer: 7x

The direct answer is option C, 7x. Use the rectangle area model by multiplying the two side expressions: (x+5)(x+2). Each part of the first side is multiplied by each part of the second side, giving x·x = x^2, x·2 = 2x, 5·x = 5x, and 5·2 = 10. Thus the complete expansion is x^2+2x+5x+10. The x-terms are the two like terms 2x and 5x, so their total is 2x+5x = 7x. Option A includes only the first x-term. Option B includes only the second x-term. Option D, 10x, incorrectly treats the constant product 10 as an x-term or multiplies coefficients without following the model. The term x^2 is quadratic and the term 10 is constant, so neither belongs in the requested total. Memory cue: collect only terms with the same variable and the same exponent; add their coefficients.

Related tags

Like-TermsRectangle ModelBinomial MultiplicationLinear TermsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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