Question 338469
Well, perimeter can be found as P = 2L + 2W.

If the length is x, and the perimeter is 26, we have

26 = 2x + 2W

Now solve for W...

2W = 26 - 2x
W = 13 - x

Area is found by length times width...so

A(x) = LW = x(13-x)