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6 December, 16:34

The area of a rectangular computer screen is 4x^2+20x+16. The width of the screen is 2x+8. What is the length of the screen?

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  1. 6 December, 20:30
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    So the area of a rectangle is Length x Width.

    A = (L) (W)

    Substitute the information given:

    4x^2 + 20x + 16 = (L) (2x+8)

    Isolate L by dividing 2x+8:

    (4x^2 + 20x + 16) / (2x + 8) = L

    If you divide:

    L = 2x + 2.
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