Posted by **Kate** on Saturday, July 17, 2010 at 11:29am.

how do I find the length and width of a rectangle when the width of the rectangle is 3 feet less tahn the length. The area is 18ft^2

- Algebra 2 -
**drwls**, Saturday, July 17, 2010 at 12:23pm
Here is how to get the answer using algebra.

L*W = L*(L-3) = 18

L^2 -3L -18 = 0

(L+3)(L-6) = 0

L = 6 or -3

Take the positive root for L. A negative length does not make sense in this case.

Then compute W.

- Algebra 2 -
**amy**, Thursday, August 25, 2011 at 8:37pm
what is an expression for an area of an equilateral triangle,A, as a function of its diameter,d?

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