SOLUTION: PLEASE HELP!! Set up an equation and solve the following problem. Suppose that the area of a square is twenty-one times its perimeter. Find the length of a side of the square.

Algebra ->  Customizable Word Problem Solvers  -> Evaluation -> SOLUTION: PLEASE HELP!! Set up an equation and solve the following problem. Suppose that the area of a square is twenty-one times its perimeter. Find the length of a side of the square.      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 457906: PLEASE HELP!!
Set up an equation and solve the following problem.
Suppose that the area of a square is twenty-one times its perimeter. Find the length of a side of the square.
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
A+=+s%5E2+=+21%2AP+=+21%2A%284s%29 ==> s%5E2+=+84s ==> s%5E2+-+84s+=+0
<==> s(s - 84) = 0 ==> s = 0 or s = 84. Hence the length of a side of the square is 84.