Question 309709
The width of a rectangular feed lot is 8 m less than the length.
 The area is 20 m squared .
 Find the length and the width. 
:
"The width of a rectangular feed lot is 8 m less than the length."
W = (L-8)
:
L * W = 20
Replace W with (L-8), find L
L * (L-8) = 20
A quadratic equation
L^2 - 8L - 20 = 0
factors to 
(L-10)*L+2) = 0
The positive solution is what we want here
L = 10 m is the length
then
W = 10 - 8
W = 2 m is the width