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    am19199's Avatar
    am19199 Posts: 1, Reputation: 1
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    #1

    Aug 24, 2010, 12:38 PM
    solving quadratic word equations
    The width of a retangle is 2 ft. less than the lenghth. The area is 15ft^2. Find the length and th width.

    What is the formula? Is it -b +-Sqr b^2 -4ac/2a. If not please show me the steps to solve this word problem.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Aug 24, 2010, 12:56 PM

    You need to set up your variables first.

    Let x be the shorter side, and y be the longer side.
    We know that

    x = y - 2
    xy = 15

    You have two equations with two unknowns. Solve simultaneously. Can you do this? :)
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