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)(x-5) = 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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