algebra

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A heating duct has a rectangular cross section whose area is 40(inches squared).
If it is 3in longer than it is wide then what is its length and width. i need both equation and answer

  • algebra -

    Area = Length * Width

    If W = x, then L = x+3

    40 = x^2 + 3x

    x^2 + 3x - 40 = 0

    (x+8)(x-5) = 0

    For each possible value of x, find x+3.

  • algebra -

    x cannot be negative, so only one of the two possible number for x is correct.

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