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A tile model arranges x²+11x+30 as a rectangle. If one side is x+5, what will the other side be?

Answer and explanation

Correct answer: x+6 — x+6

The direct answer is B: x+6. The area of the rectangle equals the product of its side lengths. We need a factor that, when multiplied by x+5, gives x²+11x+30. Factor the constant 30: the pair 5 and 6 has product 30, and their sum is 11. Thus x²+11x+30=(x+5)(x+6). Expanding verifies it: x²+6x+5x+30=x²+11x+30. A would give (x+5)²=x²+10x+25, so both the middle and constant terms are wrong. C gives (x+5)(x+11)=x²+16x+55. D gives x²+35x+150. A reliable method is to use the constant term first: 5 times the missing number must be 30, so the missing number is 6; then confirm that 5+6=11.

Related tags

FactorisationRectangle TilesVisual IdentitiesAlgebra TilesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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