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A tile model forms a rectangle for x^2 + px + 48. Its constant side parts are 6 and 8. What is p?

Answer and explanation

Correct answer: 14

The correct answer is A: p = 14. The constant term 48 is obtained from the product of the two constant side parts: 6 × 8 = 48. In the rectangle model, the two mixed rectangular regions have areas 6x and 8x. Adding them gives the middle term 6x + 8x = 14x. Comparing this with px shows that p = 14. Option B is the product 6 × 8, so it gives the constant term, not the coefficient of x. Option C is not the sum or product required by the model and does not produce the middle term. Option D doubles the correct sum; it would count the two mixed regions more than once. The factorized form is (x + 6)(x + 8) = x^2 + 14x + 48, which confirms the result. Memory cue: in (x + r)(x + s), the constant term is rs and the x-coefficient is r + s.

Related tags

Unknown CoefficientRectangle ModelVisual FactorisationQuadratic ExpressionsAlgebra TilesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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