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If the rectangle model of x^2+px+36 is formed by sides x+4 and x+9, what is the value of p?

Answer and explanation

Correct answer: 13

The correct answer is C. Multiply the two rectangle sides: (x+4)(x+9)=x^2+9x+4x+36=x^2+13x+36. Comparing this with x^2+px+36 shows that p=13. In a visual rectangle, the x by x region gives x^2, the two side strips give 9x and 4x, and the corner gives 4 times 9=36. Thus the coefficient of x is the sum 4+9, not the product. A is the difference 9-4 and does not represent the two strips together. B is the constant product, not the middle coefficient. D is twice the product 4 times 9 and is unrelated here. Memory cue: for (x+a)(x+b), the middle coefficient is a+b and the constant term is ab.

Related tags

Rectangle-ModelMiddle-CoefficientFactorisationAlgebraic-ExpansionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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