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If the tile model of (x^2+13x+36) has corner (36), which constant sides are correct?

Answer and explanation

Correct answer: 4 and 9; their sum is 13

The direct answer is C: 4 and 9. In a rectangle or tile factor model, the two constant side lengths must multiply to the corner area and add to the coefficient of x. Here 4 times 9=36 and 4+9=13, so x^2+13x+36 factors as (x+4)(x+9). A has the correct product but the wrong sum, 37. B also has product 36, but its sum is 20, not 13. D has sum 12 and product 36, so it fails the sum condition as well. The corner alone is not enough to decide; both the product and the middle-term sum must match. Memory cue: corner gives multiplication, while the two side strips together give the x-coefficient.

Related tags

Algebra TilesFactorisationQuadratic ExpressionsVisual ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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