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29 August, 14:48

The length of a rectangle is 4 inches longer than the width. If the area is 390 square inches, find the rectangle's dimensions. Round your answers to the nearest tenth of an inch.

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  1. 29 August, 15:02
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    17.8 in x 21.8 in

    Step-by-step explanation:

    Given w=width and l=length

    w*l=390

    l=w+4, therefore w * (w+4) = 390

    w^2+4w=390

    w^2+4w-390=0

    Quadratic equation, solve as such

    w=-21.8 or 17.8

    Solution can't be negative so w=17.8 in

    l=w+4 so l=21.8
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