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Which two middle strips occur in the rectangle model of \(x^2+5x+6\)?

Answer and explanation

Correct answer: \(2x\) and \(3x\)

Correct answer: B, \(2x\) and \(3x\). In a rectangle or algebra-tile model for \(x^2+5x+6\), the two middle strips must add to \(5x\), while their constant factors must multiply to 6. The numbers 2 and 3 satisfy both conditions: \(2+3=5\) and \(2\cdot3=6\). Therefore the strips are \(2x\) and \(3x\), and the factorisation is \((x+2)(x+3)\). Option A adds to \(11x\) and has the wrong constant product. Option C has coefficients 1 and 6, whose sum is 7, not 5. Option D has coefficients 1 and 5, whose product is 5, not 6. Memory cue: for \(x^2+bx+c\), find two numbers whose sum is \(b\) and product is \(c\).

Related tags

Rectangle ModelFactorisationMiddle TermAlgebra TilesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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