math

A rectangular piece of sheet metal is 4 ft longer than it is wide. (See the illustration in the link below.) The area of the piece of sheet metal is 12 ft^2. Find its length and width.
www.webassign.net/ewenmath10/11-3-003-alt.gif

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  1. length =x+4
    width =x

    x(x+4)=12
    x^2+4x-12=0
    x^2-2x+6x-12=0
    x(x-2)+6(x-2)=0
    (x+6)(x-2)=0

    length = 6
    width = 2

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