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25 May, 04:10

The length of a rectangle is 4 m more than the width the area of the rectangle is 45m^2 find the length and width

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  1. 25 May, 06:37
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    L=w+4m

    A=w*l

    A=w (w+4) = 45

    w^2+4w-45=0

    w^2+9w-5w-45=0

    w (w+9) - 5 (w+9) = 0

    (w+9) (w-5) = 0

    ⇒ w+9=0 or w-5=0

    ⇒w-5=0

    w=5

    l=5+4

    l=9
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