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A rectangle model has parts x^2, -4x, 3x, and -12. Which multiplication does it show?

Answer and explanation

Correct answer: (x-4)(x+3)

The correct answer is A. In a rectangle model, the four regions come from multiplying two binomials. The x^2 region comes from x times x. The -4x region comes from x times -4, while the 3x region comes from 3 times x. Finally, 3 times -4 gives -12. Therefore the side labels are (x-4) and (x+3), so the multiplication is (x-4)(x+3). Expanding confirms it: x^2+3x-4x-12=x^2-x-12. Option B would give positive 4x and positive 12, not the displayed signs. Option C would give -3x rather than +3x and positive 12. Option D does not produce the four given products. Always track both the numbers and their signs in signed area tiles.

Related tags

Signed-TilesRectangle-ModelFactorizationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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