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If a rectangle model has parts x^2, 8x, 15x, and 120, what are the possible side lengths of the rectangle?

Answer and explanation

Correct answer: (x+8) and (x+15)

Correct answer: D, (x+8) and (x+15). In a rectangle area model, the x^2 part comes from x multiplied by x. The two linear strips reveal the remaining pairings: x multiplied by 8 gives 8x, and x multiplied by 15 gives 15x. The corner formed by the constant lengths must then have area 8×15=120, which matches the given constant part. Therefore the complete product is (x+8)(x+15)=x^2+15x+8x+120=x^2+23x+120. Option A would produce x^2+29x+120, so its linear parts do not match. Option B does not produce the listed strips or corner. Option C gives 10x and 12x, not 8x and 15x. A useful check is to multiply the two proposed side constants and compare with the corner area.

Related tags

Rectangle-ModelFactorisationArea-PartsBinomial MultiplicationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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