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28 July, 11:47

The long side of a rectangle is 3x+21 units, and it's area is 3x^2+33x+84. Find the width

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  1. 28 July, 12:00
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    L*w=area

    (3x+21) * w=3x^2+33x+84

    w = (3x^2+33x+84) / 3x+21

    (3 (x+4) (x+7)) / 3 (x+7)

    w=x+4
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