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

Answer 1

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.

Answer 2

what is an expression for an area of an equilateral triangle,A, as a function of its diameter,d?