gr10 math
posted by Rebecca .
The playing surface in the game of curling is a rectangular sheet of ice with an area of about 225 m^2. The width is about 40m less than the length. Find the approximate dimensions of the playing surface.
How would i solve this?

Length = L meters.
Width = (L40) Meters.
L * (L40) = 225m^2,
L^2  40L = 225,
L^2  40L  225 = 0,
(L5)(L+45) = 0, 
Length = L meters.
Width = (L40) Meters.
L * (L40) = 225m^2,
L^2  40L = 225,
L^2  40L  225 = 0,
(L+5)(L45) = 0,
L+5 = 0,
L = 5.
L45 = 0,
L=45.
Choose positive value of L:
L = 45m = Length.
Width = L40 = 4540 = 5m.