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11 December, 09:02

The area of a rectangular book cover is 4x^2-6x-40. The width of the book cover is 2x-8. what is the length?

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  1. 11 December, 09:23
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    2x+5

    4x^2-6x-40 factor

    2 (2x+5) (x-4) multiply

    (2x+5) (2x-8) = area

    2x+5 = length
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