SOLUTION: Debbie has 80 metres of fencing to make a rectangular dog pound of dimensions length ,L,and width, W. What is the equation of the area of the dog pound as a function of length?

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Debbie has 80 metres of fencing to make a rectangular dog pound of dimensions length ,L,and width, W. What is the equation of the area of the dog pound as a function of length?      Log On


   

Question 120777: Debbie has 80 metres of fencing to make a rectangular dog pound of dimensions length ,L,and width, W. What is the equation of the area of the dog pound as a function of length?
Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
Perimeter = 2W + 2L = 80, so divide both sides by 2:
W+L = 40
W= 40-L

Area = LW
Area = L(40-L)
Area = 40L+-L%5E2

R^2