Posted by danica on Friday, October 19, 2012 at 5:37pm.
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  PsyDAG, Friday, October 19, 2012 at 6:37pm
Area = Length * Width
If W = x, then L = x+3
40 = x^2 + 3x
x^2 + 3x  40 = 0
(x+8)(x5) = 0
For each possible value of x, find x+3.

algebra  Shell, Sunday, October 21, 2012 at 11:58am
x cannot be negative, so only one of the two possible number for x is correct.
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