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8 April, 17:48

A farmer has a rectangular pen for her goats. The length of the pen can be represented by the expression 2x - 1. The width of the pen can be represented by the expression x + 4. Which of the following expressions represents the area of the farmer's rectangular pen?

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  1. 8 April, 18:04
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    area = 2x² + 7x - 4

    the area (A) of a rectangle = length * width

    A = (2x - 1) (x + 4) ← expand using FOIL

    = 2x² + 8x - x - 4 = 2x² + 7x - 4
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