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A rectangle has sides p + 4 and p + 7. What simplified expression is obtained from the area model?

Answer and explanation

Correct answer: p² + 11p + 28

The correct answer is A. The area of a rectangle is length multiplied by width, so calculate (p + 4)(p + 7). The area model divides this product into four parts: p × p = p², p × 7 = 7p, 4 × p = 4p, and 4 × 7 = 28. Combining like terms gives p² + 7p + 4p + 28 = p² + 11p + 28. Option B places 28 with p and 11 as the constant, reversing the roles of the products. Option C uses 3p, which comes from subtracting 7 and 4 rather than adding the two cross-products. Option D has the correct middle coefficient but the wrong constant; 4 × 7 is 28, not 11. A safe method is to multiply every part of the first binomial by every part of the second.

Related tags

Binomial MultiplicationRectangle AreaArea ModelLike TermsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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