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A tile model has area x²+9x+20. How can it be shown as the sides of a rectangle?

Answer and explanation

Correct answer: (x+4)(x+5)

The correct answer is A: (x+4)(x+5). To factor the trinomial, find two numbers whose product is the constant term 20 and whose sum is the coefficient of x, namely 9. The numbers 4 and 5 work because 4×5=20 and 4+5=9. Therefore (x+4)(x+5)=x²+5x+4x+20=x²+9x+20. In a tile model, the x² tile, 9 x-tiles, and 20 unit tiles can be arranged into a rectangle with side lengths x+4 and x+5. Option B has product 20 but sum 12, giving x²+12x+20. Option C has sum 21, and D does not give the required middle term. Check both sum and product, not just one.

Related tags

FactorisationAlgebra-TilesRectangle-AreaVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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