Question 431596
If the soccer field 135sq.ft. in area, then LXW =135.  Also, we know that L equals W+3.  Substituting for L we get:

(W+3)(W)=135
W2+3W=135
W2+3W-135=0*[invoke quadratic "x", 1, 3, -135 ]

(Throw out the negative value, since our soccer field isn't imaginary)